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【单选题】
在食品中添加铁强化剂,是由于( )
A.
骨骼和牙齿的重要组成成分
B.
的机体中参与氧的运转、交换和组织呼吸过程
C.
提高人体的免疫能力
D.
铁参与甲状腺激素的代谢
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举一反三
【单选题】You are the network administrator for TestKing. You manage a Windows Server 2003 computer named TestKing4 that functions as an application server. TestKing4 will be used for development during the nex...
A.
Create a scheduled backup job as a normal backup. Copy the backup job, and modify the start date so that one job starts every day for the next 30 days.
B.
Create a scheduled backup job as a daily backup. Set the start date of the job for today, and set the end date for 30 days from today.
C.
Create a scheduled backup job as a copy backup. Copy the backup job, and modify the start date so that one job starts every day for the next 30 days.
D.
Create a scheduled backup job as a normal backup. Set the start date of the job for today, and set the end date for 30 days from today.
查看完整题目与答案
【单选题】我国对“三同时”制度作出具体规定的行政法规是______
A.
《规划环境影响评价条例》
B.
《排污费征收使用管理条例》
C.
《全国环境监测管理条例》
D.
《建设项目环境管理保护条例》
查看完整题目与答案
【单选题】The first invention of human beings was the wheel. Although no wheel forms are found in nature, undoubtedly the earliest "wheels" were smooth logs which were used for moving weights over the earth's s...
A.
The wheel is used today in industry and transportation.
B.
One of human beings' first inventions, the wheel, has remained important for 4,000 years.
C.
The basic design of the wheel has been changed to meet the needs of industrial society.
D.
Although we don't know exactly who invented the wheel, it is evident that the Egyptians and Chinese used it about 4,000 years ago.
查看完整题目与答案
【单选题】科学家指出，食用虾类等水生甲壳类动物的同时服用维生素C容易中毒，这是因为对人体无害的＋5价砷（As）类物质在维生素C的作用下，能够转化为有毒的＋3价砷类化合物。有关说法正确的是（   ）
A.
维生素C具有还原性
B.
＋5价砷既可得电子，又可失电子
C.
AsH 3 的稳定性强于HBr
D.
上述过程中砷元素发生氧化反应，含＋3价砷的物质为氧化产物
查看完整题目与答案
【单选题】我国对“三同时”制度作出具体规定的行政法规是
A.
《规划环境影响评价条例》
B.
《排污费征收使用管理条例》
C.
《全国环境监测管理条例》
D.
《建设项目环境保护管理条例》
查看完整题目与答案
【判断题】货币在地租、借贷以及工资等方面的支付中发挥的职能是交易媒介
A.
正确
B.
错误
查看完整题目与答案
【单选题】Have you ever been afraid to talk back when you were treated unfairly? Have you ever bought something just because the salesman talked you into it? Are you afraid to ask someone for a date? Q. As used...
A.
persuade somebody to change his mind
B.
answer showing disagreement
C.
fight bravely
查看完整题目与答案
【简答题】There are forty-seven different kinds of kangaroos(袋鼠). The smallest kangaroos are about a quarter of a meter long; the biggest are taller than a man. Kangaroos have very long strong back legs. These ...
查看完整题目与答案
【单选题】关于重金属的说法不正确的是（ ）。
A.
土壤中镉的环境容量要小得多，这是土壤镉污染的一个重要特点。
B.
铬主要用于金属加工、电镀、制革等行业。
C.
土壤pH值升高，砷溶解度显著降低。
D.
砷的硫化物矿自古以来被用作颜料和杀虫剂、灭鼠药。硫化合物具有强烈毒性.
查看完整题目与答案
【单选题】Rollback segments are used for:
A.
read consistency
B.
rolling back transactions
C.
recovering the database
D.
all of the above
查看完整题目与答案
相关题目：
【单选题】You are the network administrator for TestKing. You manage a Windows Server 2003 computer named TestKing4 that functions as an application server. TestKing4 will be used for development during the nex...
A.
Create a scheduled backup job as a normal backup. Copy the backup job, and modify the start date so that one job starts every day for the next 30 days.
B.
Create a scheduled backup job as a daily backup. Set the start date of the job for today, and set the end date for 30 days from today.
C.
Create a scheduled backup job as a copy backup. Copy the backup job, and modify the start date so that one job starts every day for the next 30 days.
D.
Create a scheduled backup job as a normal backup. Set the start date of the job for today, and set the end date for 30 days from today.
查看完整题目与答案
【单选题】我国对“三同时”制度作出具体规定的行政法规是______
A.
《规划环境影响评价条例》
B.
《排污费征收使用管理条例》
C.
《全国环境监测管理条例》
D.
《建设项目环境管理保护条例》
查看完整题目与答案
【单选题】The first invention of human beings was the wheel. Although no wheel forms are found in nature, undoubtedly the earliest "wheels" were smooth logs which were used for moving weights over the earth's s...
A.
The wheel is used today in industry and transportation.
B.
One of human beings' first inventions, the wheel, has remained important for 4,000 years.
C.
The basic design of the wheel has been changed to meet the needs of industrial society.
D.
Although we don't know exactly who invented the wheel, it is evident that the Egyptians and Chinese used it about 4,000 years ago.
查看完整题目与答案
【单选题】科学家指出，食用虾类等水生甲壳类动物的同时服用维生素C容易中毒，这是因为对人体无害的＋5价砷（As）类物质在维生素C的作用下，能够转化为有毒的＋3价砷类化合物。有关说法正确的是（   ）
A.
维生素C具有还原性
B.
＋5价砷既可得电子，又可失电子
C.
AsH 3 的稳定性强于HBr
D.
上述过程中砷元素发生氧化反应，含＋3价砷的物质为氧化产物
查看完整题目与答案
【单选题】我国对“三同时”制度作出具体规定的行政法规是
A.
《规划环境影响评价条例》
B.
《排污费征收使用管理条例》
C.
《全国环境监测管理条例》
D.
《建设项目环境保护管理条例》
查看完整题目与答案
【判断题】货币在地租、借贷以及工资等方面的支付中发挥的职能是交易媒介
A.
正确
B.
错误
查看完整题目与答案
【单选题】Have you ever been afraid to talk back when you were treated unfairly? Have you ever bought something just because the salesman talked you into it? Are you afraid to ask someone for a date? Q. As used...
A.
persuade somebody to change his mind
B.
answer showing disagreement
C.
fight bravely
查看完整题目与答案
【简答题】There are forty-seven different kinds of kangaroos(袋鼠). The smallest kangaroos are about a quarter of a meter long; the biggest are taller than a man. Kangaroos have very long strong back legs. These ...
查看完整题目与答案
【单选题】关于重金属的说法不正确的是（ ）。
A.
土壤中镉的环境容量要小得多，这是土壤镉污染的一个重要特点。
B.
铬主要用于金属加工、电镀、制革等行业。
C.
土壤pH值升高，砷溶解度显著降低。
D.
砷的硫化物矿自古以来被用作颜料和杀虫剂、灭鼠药。硫化合物具有强烈毒性.
查看完整题目与答案
【单选题】Rollback segments are used for:
A.
read consistency
B.
rolling back transactions
C.
recovering the database
D.
all of the above
查看完整题目与答案