起重与吊装工作的安全作业要求包括()。A.起吊前应确认电力、物资供应等保障完善 B.

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问题:

起重与吊装工作的安全作业要求包括()。

A.起吊前应确认电力、物资供应等保障完善

B.作业前必须检查作业环境、吊索具等用品

C.吊装施工一般不得在雨雪天、露天或夜间工作

D.严禁在带电的高压线下作业

E.严禁在有风条件下进行吊装作业

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当含有下列结构片段的蛋白质在胃肠道中水解时,不可能产生的氨基酸是

[ ]

A.

B.

C.

D.

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“疮家圣药”是指()。

A.蒲公英

B.黄连

C.紫花地丁

D.金银花

E.连翘

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How should one invest a sum of money in these days of inflation (通货膨胀) Left in a bank it will hardly keep its value, however high the interest rate is. Only a brave man, or a very rich one, dares to buy and sell on the Stock Market. Today it seems that one of the best ways to protect your savings, and even increase your wealth is to buy beautiful objects from the past. Here I am going to offer some advice on collecting antique clocks, which I personally consider are among the most interesting of antiques.
I sometimes wonder what a being from another planet might report back about our way of life. "The planet Earth is ruled by a mysterious creature that sits or stands in a room and makes a strange ticking sound. It has a face with twelve black marks and two hands. Men can do nothing without its permission, and it fastens its young round people’s wrists so that everywhere men go they are still under its control. This creature is the real master of Earth and men are its slaves."
Whether or not we are slaves of time today depends on our culture and personality, but it is believed that many years ago kings kept special slaves to tell the time. Certain men were very clever at measuring the time of day according to the beating of their own hearts. They were made to stand in a fixed place and every hour or so would shout the time. So it seems that the first clocks were human beings.
However, men quickly found more convenient and reliable ways of telling the time. They learned to use the shadows cast by the sun. They marked the hours on candles, used sand in hourglasses, and invented water-clocks. Indeed, any serious student of antiques should spend as much time as possible visiting palaces, stately homes and museums to see some of the finest examples of clocks from the past.
Antique clocks could be very expensive, but one of the joys of collecting clocks is that it is still possible to find quite cheap ones for your own home. After all, if you are going to be ruled by the time, why not invest in air antique clock and perhaps make a future profit

According to the passage, collecting antique clocks ______.

A.can hardly keep the value of your savings

B.will cost much of your money

C.may increase your wealth

D.needs your bravery

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来自同一总体的两样本,下列哪个指标小的样本均数估计总体均数时更可靠()

A.S

B.CV

C.S

D.t0.05,v·S

E.

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MAN-B&W-S-MC/MCE主机操纵系统中,喷油定时自动调节机构的主要设计目的是()。

A.降低油耗

B.改善燃烧质量

C.爆压与喷油量成比例

D.稳定爆压

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