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问题 单项选择题

砂轮机必须装有用钢板制成、有足够强度的防护罩。防护罩的开口角度不超过（），其中轮轴水平中心线以上不超过65°。

A.90°

B.100°

C.60°

D.120°

答案

参考答案：A

单项选择题

我国以实验室为基础的监测系统是（）。

A.医院内感染监测系统

B.出生缺陷监测系统

C.疾病监测点监测系统

D.法定传染病报告系统

E.流行性感冒监测系统
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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.

（）is a method of constructing a project schedule network diagram that uses boxes or rectangles.

A．PDM

B．CPM

C．PERT

D．AOA
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