问答题

两个容积相同的玻璃球内充满氮气，两球中间用一玻管相通，管中间有一汞滴将两边的气体分开。当左球的温度为273 K，右球的温度为293 K时，汞滴处在中间达成平衡。试问：（1）若将左球温度升高10 K，中间汞滴向哪边移动？（2）若两球温度同时都升高10 K, 中间汞滴向哪边移动？

答案：（1）若将左球温度升高10K，中间汞滴向右球移动。（2）若两球温度同时都升高10K，中间汞滴位置不变。解析如下：（1）根...

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单项选择题

句前场________：

A、是变位动词之前的部分。
B、是已知信息。
C、具有强调意味。
D、只能放置一个短语成分。

单项选择题

Connecting Week 5 (on delivery) and Week 6 (back to content): Speakers need to trust themselves, that is, to have confidence. They also need to make themselves trustworthy in the eyes of the audience, that is, to have credibility. Of the four speakers under "Anti-nCoV Special," Bill Gates is the only one who’s not a medical specialist. Which of the following statements in his speech, then, helps to build his credibility as a speaker on medical issues?
A、If anything kills over 10 million people in the next few decades, it’s most likely to be a highly infectious virus rather than a war. Not missles, but microbes.
B、Let’s look at Ebola. I’m sure all of you read about it in the newspaper, lots of challenges. I followed it carefully through the case analysis tools we use to track polio eradication.
C、Now, in the movies it’s quite different. There’s a group of handsome epidemiologists ready to go, they move in, they save the day, but that’s just pure Hollywood.
D、The failure to prepare could allow the next epidemic to be dramatically more devastating than Ebola.