当气温低于（）时，动车组应停放于具备防冻保温功能的处所，停放

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问题单项选择题

当气温低于（）时，动车组应停放于具备防冻保温功能的处所，停放处所应具备下列条件之一：接触网供电、外接单相AC400V地面电源供电、暖库。

A、-1℃

B、0℃

C、1℃

D、2℃

答案

参考答案：B

听力题

小题1:There is a t______________ in our family that we have a party on New Year’s Eve.

小题2:Things fall to the ground because of the earth’s ________________.

小题3: All the children felt e_______________ after a long journey.

小题4:The custom of arranged marriages still ___________(存在) in many countries.

小题5:As is known to all, smoking is h______________ to people’s health.

小题6:Air is a m_________________ of gases.

小题7:To succeed, we must __________________ (结合) talent with hard work.

小题8:Children are supposed to avoid watching v_______________ programmes and video games, which are possible to cause them to become more aggressive.

小题9:I know you don’t like her but try not to make it so ______________ (明显).

小题10:The actor’s performance left a strong i_________________ on the director.

填空题

应定期对液氨罐气侧、液侧进出口阀门进行（），确保事故状态下能可靠关闭。