问题
单项选择题
采用自动控制启动方式的气体灭火系统，根据人员安全撤离防护区的需要，应有不大于（）s的可控延迟喷射。
A.30
B.60
C.90
D.120
答案
参考答案：A
解析：
采用自动控制启动方式时，根据人员安全撤离防护区的需要，应有不大于30s的可控延迟喷射；对于平时无人工作的防护区，可设置为无延迟喷射。所以，根据题意，正确答案为A。
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采用自动控制启动方式的气体灭火系统，根据人员安全撤离防护区的需要，应有不大于（）s的可控延迟喷射。
A.30
B.60
C.90
D.120
参考答案：A
解析：
采用自动控制启动方式时，根据人员安全撤离防护区的需要，应有不大于30s的可控延迟喷射；对于平时无人工作的防护区，可设置为无延迟喷射。所以，根据题意，正确答案为A。
| 任务型阅读。 | |
| In Cities in the USA, there are clocks in most stores, factories, and other buildings. Radio announcers (广播员) give the correct time during the day. 1. They want to do certain things at certain times. They don't want to be late. But time is not so important to people everywhere. 2. You will find that people living there do not like to rush. If you have an appointment (约会) with some friends, they will probably be late, 3. Even the radio programs may not begin on time. 4. In South America, many people think of a clock as a machine. 5. They don't want a clock or any machine to affect (影响) their lives so much.
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