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由天然纤维中丝纤维以及化学纤维加工制得的是
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【简答题】随着社会生产的发展、人口增多，对能源的需求量逐年增加，全球石油储量下降，寻求和制备代号称“黑金”的新能源已经成为紧迫任务．化学工作者正在研究以天然气和醇类合成优质汽油的方法．合成路线如下： 已知：（1）凡与醛基直接相连的碳原子上的氢称为α一H原子，在稀碱溶液的催化作用下，一个醛分子上的α一H原子连接到另一个醛分子的氧原子上，其余部分连接到羰基碳原子上生成羟基醛，如： （2）2R-CH 2 -Cl+...
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【单选题】读“2013年11月9日12时近地面气压（hpa）分布图”，回答下列小题。 关于图中等压线的叙述，正确的是（） ①陆地为低压，海洋为高压 ②陆地为高压，海洋为低压 ③南部等压线稀疏，北部等压线稠密 ④南部等压线稠密，北部等压线稀疏
A.
①③
B.
②④
C.
①④
D.
②③
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【单选题】对发展中国家而言,首先要摆脱贫穷。要摆脱贫穷,就要找出一条比较快的发展道路。
A.
For developing nations, first of all, they will throw off poverty. To throw it off, they have to find a way to develop fairly rapidly.
B.
To developing nations, first of all, they will throw off poverty. To throw it off, a way has to be found to develop fairly rapidly.
C.
For developing nations, the first thing is to throw off poverty. To do that, they have to find a way to develop fairly rapidly.
D.
To developing nations, the first thing they will do is to throw off poverty. To throw it off, they have to find a way to develop fairly rapidly.
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【简答题】商业发票中价格由 、 、 和 组成。
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【单选题】I felt rather _____ when I felt home for the first time to go on an exchange visit to America.
A.
happy
B.
proud
C.
nervous
D.
exciting
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【单选题】以下对计算机病毒的描述（）是不正确的。
A.
计算机病毒是人为编制的一段恶意程序
B.
计算机病毒不会破坏计算机硬件系统
C.
计算机病毒的传播途径主要是数据存储介质的交换以及网络的链路
D.
计算机病毒具有潜伏性
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【单选题】对发展中国家而言,首先要摆脱贫穷。要摆脱贫穷,就要找出一条比较快的发展道路。
A.
For developing nations, first of all, they will throw off poverty. To throw it off, they have to find a way to develop fairly rapidlly.
B.
To developing nations, first of all, they will throw off poverty. To throw it off, a way has to be found to develop fairly rapidly.
C.
For developing nations, the first thing is to throw off poverty. To do that, they have to find a way to develop fairly rapidly.
D.
To developing nations, the first thing is to throw off poverty. To do that, a way has to be found to develop fairly rapidly.
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【简答题】如下图所示，线a、b、c为等压线，箭头表示A地风向，线d、e为等温线，线f为等高线，读图完成1-2题。 1．下列说法正确的是 [     ] A．a＜b＜c B．d＞e C．若e＝0°,则河流出现凌汛 D．图中湖泊为咸水湖 2．A地未来几天的天气状况可能为 [     ] A、晴朗、气温高、气压低 B、晴朗、气温低、气压高 C、阴雨、气温降低、气压升高 D、阴雨、气温升高、气压降低
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【单选题】对发展中国家而言,首先要摆脱贫穷。要摆脱贫穷,就要找出一条比较快的发展道路。
A.
For developing nations, first of all, they will throw off poverty. To throw it off, they have to find a way to develop fairly rapidly.
B.
To developing nations, first of all, they will throw off poverty. To throw it off, a way has to be found to develop fairly rapidly.
C.
For developing nations, the first thing is to throw off poverty. To do that, they have to find a way to develop fairly rapidly.
查看完整题目与答案
【单选题】对发展中国家而言,首先要摆脱贫穷。要摆脱贫穷,就要找出一条比较快的发展道路。
A.
For developing nations, first of all, they will throw off poverty. To throw it off, they have to fin
B.
To developing nations, first of all, they will throw off poverty. To throw it off, a way has to be f
C.
For developing nations, the first thing is to throw off poverty. To do that, they have to find a way
D.
To developing nations, the first thing is to throw off poverty. To do that, a way has to be found to
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【简答题】随着社会生产的发展、人口增多，对能源的需求量逐年增加，全球石油储量下降，寻求和制备代号称“黑金”的新能源已经成为紧迫任务．化学工作者正在研究以天然气和醇类合成优质汽油的方法．合成路线如下： 已知：（1）凡与醛基直接相连的碳原子上的氢称为α一H原子，在稀碱溶液的催化作用下，一个醛分子上的α一H原子连接到另一个醛分子的氧原子上，其余部分连接到羰基碳原子上生成羟基醛，如： （2）2R-CH 2 -Cl+...
查看完整题目与答案
【单选题】读“2013年11月9日12时近地面气压（hpa）分布图”，回答下列小题。 关于图中等压线的叙述，正确的是（） ①陆地为低压，海洋为高压 ②陆地为高压，海洋为低压 ③南部等压线稀疏，北部等压线稠密 ④南部等压线稠密，北部等压线稀疏
A.
①③
B.
②④
C.
①④
D.
②③
查看完整题目与答案
【单选题】对发展中国家而言,首先要摆脱贫穷。要摆脱贫穷,就要找出一条比较快的发展道路。
A.
For developing nations, first of all, they will throw off poverty. To throw it off, they have to find a way to develop fairly rapidly.
B.
To developing nations, first of all, they will throw off poverty. To throw it off, a way has to be found to develop fairly rapidly.
C.
For developing nations, the first thing is to throw off poverty. To do that, they have to find a way to develop fairly rapidly.
D.
To developing nations, the first thing they will do is to throw off poverty. To throw it off, they have to find a way to develop fairly rapidly.
查看完整题目与答案
【简答题】商业发票中价格由 、 、 和 组成。
查看完整题目与答案
【单选题】I felt rather _____ when I felt home for the first time to go on an exchange visit to America.
A.
happy
B.
proud
C.
nervous
D.
exciting
查看完整题目与答案
【单选题】以下对计算机病毒的描述（）是不正确的。
A.
计算机病毒是人为编制的一段恶意程序
B.
计算机病毒不会破坏计算机硬件系统
C.
计算机病毒的传播途径主要是数据存储介质的交换以及网络的链路
D.
计算机病毒具有潜伏性
查看完整题目与答案
【单选题】对发展中国家而言,首先要摆脱贫穷。要摆脱贫穷,就要找出一条比较快的发展道路。
A.
For developing nations, first of all, they will throw off poverty. To throw it off, they have to find a way to develop fairly rapidlly.
B.
To developing nations, first of all, they will throw off poverty. To throw it off, a way has to be found to develop fairly rapidly.
C.
For developing nations, the first thing is to throw off poverty. To do that, they have to find a way to develop fairly rapidly.
D.
To developing nations, the first thing is to throw off poverty. To do that, a way has to be found to develop fairly rapidly.
查看完整题目与答案
【简答题】如下图所示，线a、b、c为等压线，箭头表示A地风向，线d、e为等温线，线f为等高线，读图完成1-2题。 1．下列说法正确的是 [     ] A．a＜b＜c B．d＞e C．若e＝0°,则河流出现凌汛 D．图中湖泊为咸水湖 2．A地未来几天的天气状况可能为 [     ] A、晴朗、气温高、气压低 B、晴朗、气温低、气压高 C、阴雨、气温降低、气压升高 D、阴雨、气温升高、气压降低
查看完整题目与答案
【单选题】对发展中国家而言,首先要摆脱贫穷。要摆脱贫穷,就要找出一条比较快的发展道路。
A.
For developing nations, first of all, they will throw off poverty. To throw it off, they have to find a way to develop fairly rapidly.
B.
To developing nations, first of all, they will throw off poverty. To throw it off, a way has to be found to develop fairly rapidly.
C.
For developing nations, the first thing is to throw off poverty. To do that, they have to find a way to develop fairly rapidly.
查看完整题目与答案
【单选题】对发展中国家而言,首先要摆脱贫穷。要摆脱贫穷,就要找出一条比较快的发展道路。
A.
For developing nations, first of all, they will throw off poverty. To throw it off, they have to fin
B.
To developing nations, first of all, they will throw off poverty. To throw it off, a way has to be f
C.
For developing nations, the first thing is to throw off poverty. To do that, they have to find a way
D.
To developing nations, the first thing is to throw off poverty. To do that, a way has to be found to
查看完整题目与答案