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CO₂可以用来作为超临界流体色谱的流动相。

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超临界流体色谱中，淋洗时间随流体的压力增加而缩短。

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两台起重机共同抬吊一个重物，已知重物质量为50t，索吊具质量为2t，不均衡荷载系数为l．1．其计算荷载应为（）。

A. 55t
B. 57．2t
C. 60．5t
D. 62．92t

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听力原文： M: Finally I’ve got the chance to put on my new suit tonight. I hope to make
a good impression on your family. W: Come on, it’s only a family reunion. So jeans and T-
shirts are just fine. Q: What does the woman mean？

A. The man has left a good impression on her family.
B. The man’s jeans and T-shirts are stylish.
C. The man should buy himself a new suit.
D. The man can dress casually for the occasion.

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Why did the man take over a bicycle shop？

A. He wanted to be his own boss.
B. He didn’t want to be in too much debt.
C. He didn’t want to start from scratch.
D. He found it more profitable.

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CO2可以用来作为超临界流体色谱的流动相。

超临界流体色谱中，淋洗时间随流体的压力增加而缩短。

两台起重机共同抬吊一个重物，已知重物质量为50t，索吊具质量为2t，不均衡荷载系数为l．1．其计算荷载应为（）。

听力原文： M: Finally I’ve got the chance to put on my new suit tonight. I hope to makea good impression on your family. W: Come on, it’s only a family reunion. So jeans and T-shirts are just fine. Q: What does the woman mean？

Why did the man take over a bicycle shop？

CO₂可以用来作为超临界流体色谱的流动相。

听力原文： M: Finally I’ve got the chance to put on my new suit tonight. I hope to make
a good impression on your family. W: Come on, it’s only a family reunion. So jeans and T-
shirts are just fine. Q: What does the woman mean？