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问题 单项选择题

在聚酰胺色谱中，吸附力最强的黄酮为

A．异黄酮

B．二氢黄酮

C．二氢黄酮醇

D．查耳酮

E．黄酮

答案

参考答案：E

解析：不同类型黄酮化合物，先后流出顺序一般是异黄酮、二氢黄酮醇、黄酮、黄酮醇。

单项选择题

During our two months on the road, Bennett and I had a really (1) experience with a good, honest (2) and some helpful mechanics.

We were driving east on Highway 10 when our "chick engine" light came on. We limped of a(n) (3) into Las Cruces. We had a real car (4) Bennett nursed the ear into a local garage. By this time the car was missing so (5) it was shaking all over. This was the (6) time to arrive at a garage—late Friday afternoon. Service adviser Scott was busy (7) paper work and customers as we (8) our problems. (9) he was already "ten cars behind", he told us to pull the car into the garage.

Lincoln, who we later (10) was one of the two motor technicians, took (11) of our car repairing. He and Scott and some other mechanics stayed several hours after closing, (12) the car.

Early the next morning (the shop was officially closed on Saturdays), Lincoln finally located the (13) and fixed it easily within only (14)

Later Scott (15) out to us that it was our attitude that helped. "You didn’t come into the place demanding this or that. You showed an (16) of our problems on a busy Friday afternoon. Customer’s attitude means a lot. " He was right in some way, customers should show (17) and understanding to people who (18) them. (19) people were extremely busy, they found way to at least try and help when they are met with politeness.

The pleasant experience I had shows that (20) for other people can always help.

16().

A.understanding 

B.ignorance 

C.appreciation 

D.awareness
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判断题

记录有涂改时，在涂改处须加盖货运事故处理专用章。
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