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【单选题】
原发性非典型性肺炎的病原体是A.
金黄色葡萄球菌
B.
乙型溶血性链球菌
C.
肺炎链球菌
D.
嗜肺军团菌
E.
肺炎支原体
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举一反三
【单选题】有一直径为d的钢丝,绕在直径为D的圆筒上,钢丝仍处于弹性范围。此时钢丝的最大弯曲正应力 σ max = ;为了减小弯曲应力,应 钢丝的直径。
A.
σ max = Ed /( D + d ); 增大
B.
σ max = ED /( D + d ); 增大
C.
σ max = Ed /( D + d ); 减小
D.
σ max = ED /( D + d ); 减小
【简答题】芫爆里脊丝的小料是()()()。
【单选题】The passage suggests that which of the following is a prediction concerning meteor streams that can be derived from both the conventional theories mentioned in line 18 and the new computer-derived the...
A.
Dust particles in a meteor stream will usually be distributed evenly throughout any cross section of the steam.
B.
The orbits of most meteor streams should cross the orbit of the Earth at some point and give rise to a meteor shower.
C.
Over time the distribution of dust in a meteor stream will usually become denser at the outside edges of the stream than at the center.
D.
Meteor showers caused by older by older meteor streams should be, on average, longer in duration than those caused by very young meteor streams.
E.
The individual dust particles in older meteor streams should be, on average, smaller than those that compose younger meteor streams.
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