立井罐笼提升系统的作用是把井下采区的矸石提升到地面，把设备下_爱下问搜题

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问题判断题

立井罐笼提升系统的作用是把井下采区的矸石提升到地面，把设备下放到井下。

答案

参考答案：对

单项选择题

急性糜烂性胃炎的主要发病机制为

A．白三烯合成增加

B．前列腺素合成减少

C．直接破坏黏膜屏障

D．黏液分泌减少

E．胃黏膜缺血

填空题

Questions 14-18

·Using the information in the text, complete each sentence 14-18, with a word or phrase from the list below.
·For each sentence (14-18), mark one letter (A-G) on the Answer Sheet.
·Do not mark any letter twice.
14. According to Dr. Score, lightning is caused by hail falling through ______.
15. The refrigerated rod served the same functions as ______.
16. Ice particles bouncing off hail falling through a cloud acquire ______.
17. In the paragraph four the word "duplicated" means ______.
18. According to S.E. Regnolds, there could be no lightning without ______.

A. copy
B. a positive charge
C. a negative charge
D. super cooled clouds
E. falling hail clouds
F. hail and super cooled clouds
G. moisture particles