下列哪一项制品通常可用穿过式线圈检测？（）A.棒、管和线材 B._爱下问搜题

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问题单项选择题

下列哪一项制品通常可用穿过式线圈检测？（）

A.棒、管和线材

B.需整体检查的板件

C.薄板和金属化箔

D.上述三项

答案

参考答案：A

完形填空

完形填空。

     Jimmy is very   1   at math. Mary, his sister, doesn't do well   2   it. Jimmy often helps her with her
math. One night, Jimmy and Mary take out their exercise books and begin   3   their homework. Soon
Jimmy finishes   4   his homework, but his sister    5 . She can't work   6   the last problem. "Let me
  7   you. says Jimmy. "No, please    8   . I'll do it myself. ", says Mary. She thinks and thinks, and an
hour later she   9   it out. She is very tired, but she is very  10 .

( )1. A. good
( )2. A. at
( )3. A. to make
( )4. A. do
( )5. A. doesn't
( )6. A. on
( )7. A. help
( )8. A. isn't
( )9. A. finds
( )10. A. sorry

B. better
B. in
B. do
B. to do
B. don't
B. out
B. to speak
B. couldn't
B. works
B. bad

C. fine
C. on
C. to do
C. did
C. needn't
C. at
C. helping
C. can't
C. looks
C. happy

D. well
D. of
D. to get
D. doing
D. can't
D. for
D. to tell
D. don't
D. does
D. angry

填空题

马铃薯中所含淀粉的百分率与它的密度有关.请分析下表数据，可知________。以马铃薯为原料的淀粉厂的收购员在选购马铃薯时，可以通过测出马铃薯的___________就知道马铃薯中淀粉含量的高低。