单项选择题

Aggressive or violent patients can ________ the health and safety of practice staff, and a key way to manage the risk is to develop a security policy.

A、go against the grain of
B、take advantage of
C、pose a risk to
D、play havoc with

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单项选择题

提速道岔工电结合部常见故障有（）

A.道岔转换卡阻
B．道岔不密贴
C．道岔出现红光带
D．道岔表示不良

For laminar fluid flow in a cylindrical pipe, the flow speed is the same at all points in a plane perpendicular to the axis of the pipe.

答案：不正确。