每天()时检查微机屏幕显示的采集器时间与标准北京时间(电台报时)是否一致,若差值大于(),则在正点后按规定进行调整。
参考答案:19时;30秒
听下面5段对话。每段对话后有一道小题,从每题所给的A、B、C三个选项中选出最佳选项。听完每段对话后,你将有10秒钟的时间来回答有关小题和阅读下一小题,每段对话你将听一遍。
(听力内容暂无)
What does the man have for earthquake preparation?()
A.A candle.
B.A radio.
C.A flashlight.
Was it because of the heavy snowstorm in Europe _____ the flight had to be put off? [ ]
A. which
B. so
C. why
D. that