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【单选题】
下列各组分子中，化学键均有极性，但分子偶极矩均为零的是A.
CS 2 、 BCl 3 、 CH 4
B.
NO 2 、 PCl 3 、 CH 4
C.
NH 3 、 BF 3 、 H 2 S
D.
N 2 、 CS 2 、 PH 3
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【简答题】V. 选择适当的词组填空．根据所提供的语景，从方框中选择正确的短语填空完成句子： (共8小题；每小题1分，满分8分） broke out, on the contrary , played a trick on , dressed up , in time, caught sight of , now that , in memory of , pred…fr...
【简答题】根据要求完成相关任务。 在搭乘公共汽车和火车时，我们不但要遵守安全规则，还要注意礼让，才能拥有愉快的旅行。以下是搭乘公共交通工具时我们要遵守的一些安全规则及行为准则，用“R” “C”。 ( )1. We should give our seats to an old person or a sick person. ( )2. Do not talk to the driver ...
【简答题】转换下列十进制数为十六进制数：
【简答题】We can build a really good response system. We have the benefits of 1. ___________ that we talk about here. We've got 2.________ to get information from the public and get information out to them. We ...
【简答题】什么是最大实体要求的零几何公差、最小实体要求的零几何公差?
【简答题】十六进制数169 转换为十进制结果为A. 361
【单选题】听力原文：W: We'd better get moving if we don't want to be late. M: Take it easy. It's three o'clock now. Q: What does the man mean? (17)
A.
They'd better hurry because they have no time to lose.
B.
They needn't hurry because they still have time.
C.
They will not be late because it is easy to get there.
D.
They should take the easiest way in order not to be late.
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