问题
单项选择题
所有暴露于井压中的管汇部件的额定工作压力必须（）在用防喷器的压力级别。
A、等于或大于
B、等于
C、小于或等于
答案
参考答案：A
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所有暴露于井压中的管汇部件的额定工作压力必须（）在用防喷器的压力级别。
A、等于或大于
B、等于
C、小于或等于
参考答案：A
| 用方框中所给词完成句子。 | |
2. We should help each other and ______ each other. 3. The chemistry teacher was ______ all the students last term. 4. You could talk to Bob, and he might _____ you to the people. 5. More than 200 teams from all over China _____ this year's Odyssey. 6. You must _____ speaking English as much as you can. 7. The ______ of China is a serious problem. 8. You should do the cleaning every day and keep your room clean and _____. 9. All this talk on food is making me _____. 10. —Can you _____ him to me? —He has big eyes, a small nose and blond hair. |