问题
单项选择题
高压二氧化碳储存容器中充装的二氧化碳质量损失大于（）时，二氧化碳灭火系统的检漏装置应正确报警。
A.3%
B.5%
C.10%
D.15%
答案
参考答案：C
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高压二氧化碳储存容器中充装的二氧化碳质量损失大于（）时，二氧化碳灭火系统的检漏装置应正确报警。
A.3%
B.5%
C.10%
D.15%
参考答案：C
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| When a friend was visiting David, it began 1 . So David told him 2 that night. "You may stay here 3 the night," he said. "OK," answered his friend. But 4 minutes 5 , the friend went out. He didn't tell David where 6 going nor (也没有) did he ask for an umbrella. When David was about 7 , his friend 8 . He was all wet through. "Where 9 you 9 ?" asked David. "I have been 10 ," answered the friend, "to tell my mother that I'll not go home tonight because of the rain." | ||||
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