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【简答题】
判断下列命题是否正确， （1）梯形可以确定一个平面． （2）圆心和圆上两点可以确定一个平面； （3）已知a，b，c，d是四条直线，若a ∥ b，b ∥ c，c ∥ d，则a ∥ d （4）两条直线a，b没有公共点，那么a与b是异面直线； （5）α、β是平面，且直线a?α，直线b?β，则a，b是异面直线，其中正确的命题是______．
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【简答题】子宫收缩力的特点是(1)(2)(3)
【简答题】At the moment quite a lot of IT companies are losing money, but they __________, hoping that the industry will in time improve. (hang)
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