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问题 单项选择题

报警及监控系统是利用现代（），对可能发生的抢劫、火灾等紧急情况，能够（手动）自动现场报警，并将警情自动传送到报警中心的一种技术设施。

A、计算机技术

B、信息技术

C、电子探测技术

D、遥感技术

答案

参考答案：C

单项选择题

（）is a method of constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the dependencies.

This method includes following types of dependencies or precedence relationships:（）, the initiation of the successor activity, depends upon the completion of the predecessor activity.

（）, the initiation of the successor activity, depends upon the initiation of the predecessor activity.

（）, the initiation of the successor activity, depends upon the initiation of the predecessor activity.

A．F-S

B．F-F

C．S-F

D．S-S
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单项选择题

搅拌混凝土称量水的允许偏差为（）％。

A.3

B.2

C.1

D.1.5
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