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【单选题】
刚体作平面运动时，其平面图形上各点的瞬时速度的大小和相同，则该瞬时刚体的角加速度____________。A.
必须等于零
B.
可以等于零，也可以不等于零
C.
必须不等于零
D.
必须为正值
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举一反三
【单选题】—I didn’t do well in the last English test.How about you? —_______.
A.
I’ll do better next time
B.
I like English, though
C.
A lot better
D.
Even worse
【单选题】. — I didn’t do well in the last English contest. How about you? — ____.
A.
I’ll do better next time
B.
I like English, though
C.
A lot better
D.
Even worse
【单选题】听力原文： Ever since Philo T. Farnsworth assembled the first television set in his Indiana garage in 1927, the basic technological principles for bringing electronic pictures into the home have remained t...
A.
In the later 1920s.
B.
In the mid-1950s.
C.
In the 1970s.
D.
In the mid-1980s.
【单选题】下列说法正确的是
A.
NaOH的摩尔质量为40g
B.
1mol O 2 的质量与它的相对分子质量相等
C.
1mol OH — 的质量为17g/ mol
D.
氦气的质量（单位g/ mol）在数值上等于它的相对原子质量
【判断题】Studies generally show that organizations with profit sharing plans have higher levels of profitability than those without.
A.
正确
B.
错误
【单选题】— Did you get your report card today, Susan? — Yes, I did. I didn’t do well in science. Because it’s too _______.
A.
interesting
B.
difficult
C.
funny
D.
easy
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