启动电动机连续运行时间不得超过15s，一次不能启动需间隔10s后再启动。
参考答案：错
When the Eiffel Tower was shown in 1889 at the world exposition, it was not very popular and came close to ______ down.
A．be torn
B．tear
C．tearing
D． being torn
下列适用范围最广泛的是（）。
A.通知
B.通告
C.公告
D.通报
