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【单选题】
推车过弯道、风门、道岔、下坡道等地点时一律要进行（）。
A.
打信号灯
B.
安全喊话
C.
吹口哨
D.
给调度室打电话
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Entertainment in LondonBuying Books Londoners are great readers. They buy vast numbers of newspapers and magazines and even of books especially paperbacks, which are still comparatively cheap in spite...
A.
It’s to the cast of London.
B.
It’s street of bookstores.
C.
It’s a center for second-hand books.
D.
It’s where worthless books are sold.