反应A+B=C+D达平衡时，各物质的化学势一定相等。
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Questions 1 and 2 are based on the news report you have just heard.[音频]Question 1
A. The number of male nurses has gone down.
B. There is discrimination against male nurses.
C. There is a growing shortage of medical personnel.
D. The number of nurses has dropped to a record low.
Question 2
A. Working conditions.
B. Educational system.
C. Inadequate pay.
D. Cultural bias.
在下列网络中的传输介质中,抗干扰能力最好的一个是( )
A. 光缆
B. 同轴电缆
C. 双绞线
D. 电话线
Question 3 and 4 are based on the news report you have just heard.[音频]Question 3
A. It is the largest of its kind.
B. It is going to be expanded.
C. It is displaying more fossil specimens.
D. It is starting an online exhibition.
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