有四个容量都为500毫升的瓶子，分别装满海水、纯水、酒精和汽油_爱下问搜题

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问题选择题

有四个容量都为500毫升的瓶子，分别装满海水、纯水、酒精和汽油，那么装的质量最多的是（ρ_海水＞ρ_纯水＞ρ_酒精＞ρ_汽油） [ ]

A．海水

B．纯水

C．酒精

D．汽油

答案

答案：A

改错题

     We know that the last part of the 20th century saw
more large inventions: the helicopter in 1909,
movies by 1926, the computer in 1928 and the
jet plane in 1930. The middle part of the 20th century
bring
new ways to help people get over disease. They made
people healthier and live long. By this time most
people had led a very well life. Of course new inventions
continued to be made. The world is known
to man and the universe was not. Many countries began
look for ways to go into space. Russia made the first  step.

1._____
2._____
3._____

4._____
5._____
6._____
7._____
8._____
9._____
10._____

问答题简答题

地下车库中的变电房能否直接采用车库中的风送入变电房内？JGJ100-98规定车库通风系统独立设置，且变电房吸入车库中空气有危险因素。