问题
单项选择题
CNG加气站为了防止储气罐排污阀失灵，采取正确的措施应（）
A.减小排气次数
B.减小排气时间
C.排气时、排气阀半开半闭
D.设置串联的两个排污阀
答案
参考答案：D
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CNG加气站为了防止储气罐排污阀失灵，采取正确的措施应（）
A.减小排气次数
B.减小排气时间
C.排气时、排气阀半开半闭
D.设置串联的两个排污阀
参考答案：D
| 用方框中所给词的适当形式填空。 | |
2. Thanks for_________me to your birthday party. 3. Could you_________us your family photos? 4. The radio says it will stop_________. 5. On weekends she always_________her brother. 6. Can you come over to_________our science report? 7. He is very funny. He always makes his classmates_________． 8. Last Saturday my best friend_________me with my math. 9. He doesn't like talking or laughing. He's_________and quiet. 10. Mr. Green won't go to the concert_________he is'really busy. |