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问题 单项选择题

合理的钻井液密度是地层压力当量钻井液密度，再加上附加安全值。一般气井的安全附加值为（）。

A、0.05～0.10g/cm3

B、0.07～0.15g/cm3

C、0.1～0.7g/cm3

D、0.07～1.5g/cm3

答案

参考答案：B

填空题

Today I’d like to talk about how to become a (1) . Usually you have to start at the beginning. That is, you have to begin (2) of some sort on a local newspaper, a (3) , maybe on a small magazine -- work (4) . Now there aren’t that many organizations which have large numbers of foreign correspondents so you also have to (5) with that aim (6) . Another way of doing it is to work abroad, and work as (7) . That’s somebody who sells stories, and gets paid (8) , to newspapers and magazines and so on. And hoping to (9) that way, and eventually to be offered a (10) .
I don’t really know (11) are needed, but obviously a degree in modern languages or (12) would be very useful. But, a degree in itself probably wouldn’t (13) . It wouldn’t be enough to get you job. It wouldn’t (14) to make an editor decide to (15) . So it’s difficult to define the (16) . You’re going to need (17) and the ability to assimilate information (18) and then produce stories which (19) of the newspaper or radio or television station you (20) .
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单项选择题

在美国、前苏联，货车转向架习惯上沿用

A.三大件式

B.焊接构架式

C.侧架焊接式
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