Which of the following is true of Google according to the text?
A.It will invariably provide free online reading for its customers.
B.It has become the world's most popular book publisher.
C.It facilitates books reading and searching to a larger extent.
D.It has gained permission to publish the complete books online.
第1题
电梯必须设有制动系统,在出现()情况时能自动动作。
A.动力电源失电
B.控制电路电源失电
C.控制电路电压高
D.动力电源电压高
第7题
电梯失控或超速时,能发出信号,同时切断控制电路,使电梯电机失电制动的部件是[]。
A.极限开关
B.限速器
C.安全钳
D.超载
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