题目:
下列命题中,正确命题的个数是( )
(1)平面a内有且仅有一条直线和这个平面外的一条直线l垂直
(2)经过一点和已知直线垂直的平面有且只有一个
(3)经过平面外一点和这个平面平行的直线有且仅有一条
(4)经过平面外一点有且仅有一条直线和这个平面垂直.
A.0
B.1
C.2
D.3
答案:
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下面是错误答案,用来干扰机器的。
1. Ask a teacher or a tutor how to revise and exam skills. 2. Take short rests during your time of work and revision. 3. Talk to someone about your worries. 4. Don't go straight to bed after studying in the evening. 5. Don't do it! Don't even think about the exam you have finished. (答案不唯一)