设点P(-4，2)，Q(6，-4)，R(12，6)，S(2，12)，则下面四个结论：①PQ∥SR；②PQ⊥PS；③PS∥QS；④RP⊥QS.正确的个数是( )_刷题宝

题干

设点P(-4，2)，Q(6，-4)，R(12，6)，S(2，12)，则下面四个结论：①PQ∥SR；②PQ⊥PS；③PS∥QS；④RP⊥QS.正确的个数是( )

A：1

B：2

C：3

D：4

上一题下一题 0.0难度选择题更新时间:2013-07-03 05:36:00

答案(点此获取答案解析）

C

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A

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Hello, friends! My 1 is Andy. I have black hair and I 2 glasses. My friends say I am cool with them. I am in 3 this year. I like all my lessons, 4 I'm not good at Maths. I love football very much. I often play football with my classmates. 5 are all nice. I love them.

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⑴ ____ A.

⑵ ____ B.

⑶ ____ C.

⑷ ____ D.

⑸ ____ E.

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