试题与答案

液压起货机操纵机构可采用手控双联比例减压阀来()。A.控制油的流向 B.控制油的压力

题型:单项选择题

题目:

液压起货机操纵机构可采用手控双联比例减压阀来()。

A.控制油的流向

B.控制油的压力

C.控制油的流量

D.A和B

答案:

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参考答案:A解析:分子量小的游离香豆素类化合物多具有芳香气味与挥发性,能随水蒸气蒸馏出来。

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The words, so small, didn't seem  40  enough to hold my new life. But the world changed and I awoke on a train moving across the country. I watched the  41_  change from green trees to flat dusty plains to high mountains as I saw strange new plants that  42  mysteries(奥秘) yet to come. Finally, we arrived and  43  into our new home.

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38. A. hoping              B. admitting         C. realizing            D. believing  

39. A. going                B. moving           C. driving                 D. flying    

40. A. good                 B. simple            C. big                       D. proper    

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