梯子如需接长使用，接头只允许有一处，且连接后梯梁的强度不应低

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问题单项选择题

梯子如需接长使用，接头只允许有一处，且连接后梯梁的强度不应低于（）。

A.单梯梯梁强度的70%

B.单梯梯梁强度的80%

C.单梯梯梁强度的90%

D.单梯梯梁的强度

答案

参考答案：D

问答题简答题

制定灌溉制度有哪些方法？

单项选择题

In teaching a female client who is HIV-positive about pregnancy, the nurse would know more teaching is necessary when the client says,

A．"The baby can get the virus from my placenta. "

B．"I'm planning on starting on birth control pills. "

C．"Not everyone who has the virus gives birth to a baby who has the virus. "

D．"I'll need to have a C-section if I become pregnant and have a baby. "