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问题 选择题
P、Q、R三点在同一条直线上，物体做匀加速直线运动，经过P点的速度为v，经过Q 点的速度为2v，到R点的速度为3v，则PQ：QR等于（　　）

A．1：3

B．3：5

C．3：8

D．P点速度不为零，因而无法判定

答案

答案：B

多项选择题

焊机按照焊接电源的不同可分为

A.交流焊机

B.直流焊机

C.亚弧焊机

D.电渣压力焊机
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单项选择题

When completing an assessment of a healthy adolescent client, which of the following would be most appropriate

A．Obtain a detailed account of the adolescent's prenatal and early developmental history.

B．Discuss sexual preferences and behaviors with the parents present for legal reasons.

C．Discuss the client's smoking with parents present in the room.

D．Assess the adolescent in private; gather additional information from the parents.
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