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问题 选择题
若关于x的不等式ax-b＞0的解集是（1，+∞），则关于x的不等式
ax+b
x-2
＞0的解集是（　　）
A．（-∞，-1）∪（2，+∞）B．（-1，2）C．（-1，2）D．（-∞，1）∪（2，+∞）
答案

因为不等式ax-b＞0的解集是（1，+∞），所以a=b＞0，

所以

ax+b
x-2
＞0等价于（x+1）（x-2）＞0，

所以x＜-1或x＞2

故选A．

改错题

单句改错。

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多项选择题

工程上使用的原材料、半成品和构配件，进场前必须有（），经监理工程师审查并确认其质量合格后方可进场。

A．产品出厂合格证

B．技术说明书

C．生产厂家的营业执照

D．质检部门的质量检验合格证明

E．检验或试验报告
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