采用水浸法探伤时，根据（）产生的回波情况进行缺陷评定。A.第一_爱下问搜题

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问题单项选择题

采用水浸法探伤时，根据（）产生的回波情况进行缺陷评定。

A.第一次表面回波之前和第二次表面回波之后

B.第一次表面回波和第二次表面回波之间

C.多次回波

D.以上都不对

答案

参考答案：B

完形填空

完形填空。

     Would you like to take a  job which pays just one euro (欧元)?
     These days people   1   are out of work (失业) in Germany are asked to do the "one-euro" jobs. That is to say,
they can get paid   2  ,   only one euro an hour or about 200 euros a month   3 they have finished their jobs. So   4 do
the jobs include? They mainly include some   5   service work, such as reading for old people,   6   streets and planting
trees. The workers are   7   to sit through three or four weeks of training before they do the jobs.
     According to a German report,   the one-euro jobs are voluntary (自愿的), and many lazy jobless people aren't
willing to (不乐意) take the jobs. "It's a serious problem that many people in Germany   8   jobs, especially the youth.
That's why we   9   those people, especially the younger people,    to take the "one-euro" jobs. If they   10   to do the
jobs, they cannot get any other help," said an official.

( )1. A. whom
( )2. A. better
( )3. A. before
( )4. A. how
( )5. A. important
( )6. A. crossing
( )7. A. used
( )8. A. lost
( )9. A. teach
( )10.A. refuse

B. which
B. more
B. after
B. what
B. home
B. passing
B. asked
B. got
B. hope
B. help

C. who
C. less
C. unless
C. who
C. difficult
C. sweeping
C. offered
C. took
C. expect
C. decide

D. whose
D. fewer
D. since
D. that
D. public
D. destroying
D. agreed
D. finished
D. develop
D. try

选择题

长期露置于空气中，质量增加的是…( )

A．浓硫酸

B．浓盐酸

C．稀硫酸

D．亚硫酸钠