问题
判断题
开车过程中，当烃类物质引入时发生了爆炸可能是系统中空气没有置换干净。
答案
参考答案：对
搜题请搜索小程序“爱下问搜题”
开车过程中，当烃类物质引入时发生了爆炸可能是系统中空气没有置换干净。
参考答案：对
Passage Four
Why haven’t British government bodies initiated any studies
A．Because they do not take the problem of sleepy drivers on motorways as of great significance.
B．Because they have not been aware of the seriousness of the problem of sleepy drivers.
C．Because they have no figures on the number of accidents caused by drivers’ sleepiness.
D．Because they plan to support relevant researches or a general study on "driver behaviour".