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【简答题】
小明想知道油的密度,于是他和用天平和量筒做了如下实验: 将天平放在____工作台上,将游码放在____处,若发现指针指在分度盘的右侧,要使横梁平衡,____。 用天平测出空烧杯的质量为17g,在烧杯中倒入适量的酱油,测出烧杯和酱油的总质量如同甲所示,将烧杯中的酱油全部倒入量筒中,酱油的体积如图乙所示,则烧杯中酱油的质量为____g,酱油的密度为____ 。 小明用这种方法测出的酱油密度会____ 填“偏大”或“偏小” 小明不小心将量筒打碎了,只用天平也能测出酱油的密度。于是添加了两个完全相同的烧杯和适量的水,设计了如下实验步骤,请你补充完整。 1调好天平,用天平测出空烧杯的质量为 。 2将一个烧杯____,用天平测出烧杯和水的总质量为 。 3用另一个烧杯装满酱油,用天平测出烧杯和酱油的总质量为 。 4酱油的密度表达式 ____ 已知水的密度为
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举一反三
【单选题】关于毒物的分类,下列说法中错误的是
A.
可按毒物的化学性质分类
B.
可按毒理性质分类。
C.
可按应用范围分类。
D.
不能进行混合分类。
查看完整题目与答案
【单选题】The example of a young golfer is given to show that heroes may______.
A.
have a good and perfect family
B.
be exposed to various temptations
C.
let us down with their bad behavior
D.
serve as role models for most people
查看完整题目与答案
【单选题】脓液中的脓球是指变性坏死的(16 真题上 60)
A.
浆细胞
B.
淋巴细胞
C.
嗜酸性粒细胞
D.
单核细胞
E.
中性粒细胞
查看完整题目与答案
【单选题】关于病毒和人类生活的关系,下列说法错误的是
A.
病毒可以引起人类的多种疾病，严重危害人类健康
B.
病毒主要是对人和一些动物有害，对农作物等基本没有危害
C.
在基因工程中，小小病毒帮了大忙
D.
某些病毒可被利用来制取疫苗，预防疾病
查看完整题目与答案
【单选题】关于强心苷类药物的毒性反应，下列说法中错误的是
A.
胃肠道反应
B.
中枢神经系统反应
C.
视觉障碍
D.
肝功能损害
E.
心脏反应
查看完整题目与答案
【多选题】Byronic heroes have the feature of being _____
A.
rebellious
B.
hard-working
C.
brave
D.
lonely
查看完整题目与答案
【单选题】听力原文： Many of the heroes of all times have been distinguished men of the sea. Such a man was Thomas Scott. (15[D])Captain Scott performed many brave deeds, but perhaps his most remarkable act was the ...
A.
he was a sea captain
B.
he crossed a river full of ice
C.
he saved the boat almost at the price of his life
D.
he saved many people with a tugboat
查看完整题目与答案
【单选题】中高层建筑阳台栏杆高度不小于( )mm。
A.
900
B.
1000
C.
1050
D.
1100
查看完整题目与答案
【简答题】Much has been said and written about heroes now, mainly because many people think we have too few of them. There are many different kinds of heroes, but they usually seem to have two things. First, he...
查看完整题目与答案
【简答题】A．Because they are well-made and the stories are interesting. B．Because the heroes have to cope with many problems and frustrations. C．Because the characters in the movies arc free to do whatever they...
查看完整题目与答案
相关题目：
【单选题】关于毒物的分类,下列说法中错误的是
A.
可按毒物的化学性质分类
B.
可按毒理性质分类。
C.
可按应用范围分类。
D.
不能进行混合分类。
查看完整题目与答案
【单选题】The example of a young golfer is given to show that heroes may______.
A.
have a good and perfect family
B.
be exposed to various temptations
C.
let us down with their bad behavior
D.
serve as role models for most people
查看完整题目与答案
【单选题】脓液中的脓球是指变性坏死的(16 真题上 60)
A.
浆细胞
B.
淋巴细胞
C.
嗜酸性粒细胞
D.
单核细胞
E.
中性粒细胞
查看完整题目与答案
【单选题】关于病毒和人类生活的关系,下列说法错误的是
A.
病毒可以引起人类的多种疾病，严重危害人类健康
B.
病毒主要是对人和一些动物有害，对农作物等基本没有危害
C.
在基因工程中，小小病毒帮了大忙
D.
某些病毒可被利用来制取疫苗，预防疾病
查看完整题目与答案
【单选题】关于强心苷类药物的毒性反应，下列说法中错误的是
A.
胃肠道反应
B.
中枢神经系统反应
C.
视觉障碍
D.
肝功能损害
E.
心脏反应
查看完整题目与答案
【多选题】Byronic heroes have the feature of being _____
A.
rebellious
B.
hard-working
C.
brave
D.
lonely
查看完整题目与答案
【单选题】听力原文： Many of the heroes of all times have been distinguished men of the sea. Such a man was Thomas Scott. (15[D])Captain Scott performed many brave deeds, but perhaps his most remarkable act was the ...
A.
he was a sea captain
B.
he crossed a river full of ice
C.
he saved the boat almost at the price of his life
D.
he saved many people with a tugboat
查看完整题目与答案
【单选题】中高层建筑阳台栏杆高度不小于( )mm。
A.
900
B.
1000
C.
1050
D.
1100
查看完整题目与答案
【简答题】Much has been said and written about heroes now, mainly because many people think we have too few of them. There are many different kinds of heroes, but they usually seem to have two things. First, he...
查看完整题目与答案
【简答题】A．Because they are well-made and the stories are interesting. B．Because the heroes have to cope with many problems and frustrations. C．Because the characters in the movies arc free to do whatever they...
查看完整题目与答案