问题
单项选择题
磁压力式氧分析仪当测量范围在20.8%附近时，比如在20％～30％O2，一般选用（）作参比气。
A、氮气
B、氢气
C、氧气
D、空气
答案
参考答案：D
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磁压力式氧分析仪当测量范围在20.8%附近时，比如在20％～30％O2，一般选用（）作参比气。
A、氮气
B、氢气
C、氧气
D、空气
参考答案：D
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| Mr Smith lives in the small village, but he works in an office in a big city. He goes to work by train every morning and comes 1 the same way. One morning while he was 2 his newspaper on the train, a man 3 him came up to him. Mr Smith had not met him before. The man said, " 4 "to him and then 5 to talk to him. The man said, "Your 6 isn't interesting, is it? You got on the same train at the same station at the same time 7 morning and you always sit in the same seat and read the same newspaper.” When Mr Smith 8 this, he put his newspaper down, turned around and 9 the man angrily, "How do you know all that about me?" "Because I'm 10 sitting in the same seat behind you," the man answered. | |||
| ( )1. A. family ( )2. A. reading ( )3. A. before ( )4. A. Sorry ( )5. A. refused ( )6. A. life ( )7. A. one ( )8. A. heard ( )9. A. asked ( )10. A. never | B.house B.look B.behind B. Thanks B. stopped B. work B. every B. listened B. said B. hardly | C.home C.seeing C.beside C. Hello C. began C. office C. this C. found C. told C. always | |