《煤矿安全规程》第四十八条规定,一个采区内同一煤层双翼开采最多布置()及以上采煤工作

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《煤矿安全规程》第四十八条规定,一个采区内同一煤层双翼开采最多布置()及以上采煤工作面同时作业,()个掘进工作面。

A.2个;4个 

B.3个;4个 

C.1个;2个

考点:煤矿安全生产知识竞赛煤矿采煤掘进考试煤矿采煤掘进考试题库
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In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were (1) from World Wide Websites that seemed to (2) almost daily a few years earlier, some people had predicted that consuners accustomed to shopping in stores would be (3) to buy things that they could not see or touch (4) . For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient (5) to driving to the store.

A research estimated that in 1998 US consumers could purchase $ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, (6) the rise of online auctions and Websites that did comparison shopping on the Internet for the best (7) .

For all the consumer interest, (8) in eyberspaee was still a largely (9) business, however. Internet pioneer Amazon. eom, which began selling books in 1995 and later (10) into recorded music and videos, posted (11) of $ 153.7 million in the third quarter, up from $ 37.9 million in the same period of 1997. Overall, (12) , the company’ s loss widened to $ 45.2 million from $9.6 million, and analysts did not expect the company to turn a profit (13) 2001. (14) the great loss, Amazon. tom had a stock market value of many billions, reflecting investors’ (15) about the future of the industry.

Internet retailing appealed (16) investors because it provided an efficient means for reaching millions of consumers without having the cost of operating (17) stores with their armies of salespeople. Selling online carried its own risks, however, (18) so many companies competing tor consumers’ attention, price competition was (19) and profit (20) thin or nonexistent.

20()

A.benefits

B.margins

C.advantages

D.gains

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“是故骈於明者,乱五色,淫文章,青黄黻黻之煌煌非乎?”中“五色”是指()。

A.青、黄、赤、白、紫

B.青、黄、绿、白、黑

C.青、黄、赤、白、黑

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一个正方形的边长是3分米,它的周长是______分米.

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饰面板安装前,应将其侧面和背面清扫干净,并修边打眼,每块板的上、下边打眼数量均不得少于()个。

A.2 

B.3 

C.1 

D.4

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男西服手近袋推板,以前衣片中线为y轴,袋口长度的档差若为0.4cm,手巾袋上靠近前中线的端点横向变化值为0.2cm,则手巾袋上另一端点的横向变化值为()cm。

A、0.2

B、0.4

C、0.6

D、0.8

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