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【简答题】
—Was the driving pleasant when you went to Mexico last summer? —No, it ________ (rain) for four days when we arrived, so the roads were very muddy.
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【单选题】有H2和N2的混合气体50mL,加空气燃烧后,体积减少15mL,则H2在混合气体中的体积百分含量为( )。
A.
0.3
B.
0.2
C.
0.1
D.
0.45
【简答题】梁发生弯曲变形时横截面内力有( )和( )。
【判断题】含有 N 2 和 H 2 的混合气体中 N 2 的分 体积 V (N 2 ) = n (N 2 ) R T / p ( 总 ) 。
A.
正确
B.
错误
【简答题】My favorite physicist (物理学家) is Qian Xuesen. He was born in Shanghai on December 11, 1911. He was a little fat and of medium height. And his eyes were wise. He liked music, art and science (科学). He st...
【单选题】世界最大最长的珊瑚礁群是位于南半球的哪片珊瑚礁?()
A.
远洋礁
B.
玉琢礁
C.
宣德群礁
D.
大堡礁
【简答题】( )是世界最大最长的珊瑚礁群。
【单选题】有H2和N2的混合气体50mL,加空气燃烧后,体积减小15mL,则H2在混合气体中的体积百分含量为()。
A.
30%
B.
20%
C.
10%
D.
45%
【判断题】含有 N 2 和 H 2 的混合气体中, N 2 的分体积 V (N 2 )= n (N 2 ) RT / p ( 总 ) 。 ( )
A.
正确
B.
错误
【简答题】Liu Kai is my classmate. He is a good student and always ready to help the others. One day on his way school, he saw a little girl crosses the road. A car was coming towards to her quickly and the gir...
【单选题】有H2和N2的混合气体50mL,加空气燃烧后,体积减少15mL,则H2在混合气体中的体积百分含量为()。
A.
30%
B.
20%
C.
10%
D.
45%
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