题目内容

900句 T/F question 497I’m sorry that I don’t know the boom mike was working.[音频]

A. 对
B. 错

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900句 T/F question 514Our windshield has cracked because of bird strike.[音频]

A. 对
B. 错

900句 T/F question 543Request descent because of low pressure in some of our fuel pumps.[音频]

A. 对
B. 错

900句 T/F question570One of our hydraulic system has malfunctioned. Request divert immediately.[音频]

A. 对
B. 错

简单说明一下8253计数器的两种计数启动方式？