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问题 单项选择题

一般安全事故是（）。

A、一次死亡30人以上，或者一次造成直接经济损失人民币1亿元以上，或者造成特别严重社会影响的安全事故

B、一次死亡10人以上、30人以下，或者一次造成直接经济损失5000万元以上、1亿元以下，或者造成严重社会影响的安全事故

C、一次死亡3人以上、10人以下，或者一次造成直接经济损失500万元以上、5000万元以下，或者造成较严重社会影响的安全事故

D、一次死亡1人以上、3人以下，或者一次造成直接经济损失200万元以上、1000万元以下，或者造成社会影响的安全事故

答案

参考答案：C

多项选择题

对于上回转的小车变辐的塔式起重机，吊钩装置顶部至小车架下端的极极限位置应为（）

A.起升钢丝绳的倍率为2倍率时，其极限位置应为1000mm

B.起升钢丝绳的倍率为2倍率时，其极限位置应为800mm

C.起升钢丝绳的倍率为4倍率时，其极限位置应为700mm

D.起升钢丝绳的倍率为4倍率时，其极限位置应为400mm
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单项选择题

Government officials reported three new cases of mad cow, bringing the total so far this year to 99. Last year, France recorded just 31 cases of the mad cow disease. The rising numbers are in part (1) a new testing program that focuses on cows that are most (2) . That program has (3) 39 cases. But still 60 new cases were identified in the usual way, (4) were found in 1999. Many scientists (5) that this year, five years after safety precautions were (6) , the number of cases would be (7) .

The rise in cases has (8) some scientists to question whether the disease can be transmitted in ways not yet understood. Scientists are still (9) the disease, first recognized in cows in 1986.

It appears that it is not caused by a bacteria, virus or fungus, but (10) infectious particles called prion, perhaps (11) a virus or other agent. The disease kills cells in the brain, (12) it spongy and full of holes.

France has taken more steps to (13) safety than most European countries, (14) refusing to take English beef (15) the European Union. But some scientists believe that France has not been (16) in imposing the ban on feed that (17) animal pans.

Some French officials hope that the sudden interest in mad cow disease will mean that French consumers will become educated about it, thereby recognizing that French beef is actually (18) controlled. Every cow is given a passport at birth, and extensive information about its parentage and (19) it was raised must be (20) to any slaughterhouse. When a diseased animal is found, the entire herd is destroyed.

4（）

A. more

B. far more

C. far more than

D. less than
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