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问题 多项选择题

国务院《社会信用体系建设规划纲要（2015-2020年）》提出哪些企业或单位为重点，健全安全生产准入和退出信用审核机制，促进企业落实安全生产主体责任以这几个方面提出建设要求。（）

A、煤矿、非煤矿山

B、危险化学品、烟花爆竹

C、特种设备生产企业

D、民用爆炸物品生产、销售企业和爆破企业

答案

参考答案：A, B, C, D

单项选择题

Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hyperlinks--there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

A．direct

B．navigate

C．indicate

D．go-on
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单项选择题

一个正弦波振荡器的开环电压放大倍数为A，反馈系数为F，能够稳定振荡的幅值条件是（）。

A.｜AF｜>1

B.｜AF｜<1

C.｜AF｜=1

D.｜AF｜=0
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