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【单选题】
不属于β内酰胺酶抑制剂复方制剂的是( )A.
阿莫西林克拉维酸钾
B.
头孢哌酮舒巴坦
C.
氨苄西林舒巴坦
D.
亚胺培南西司他丁
E.
哌拉西林他唑巴坦
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皮皮学刷刷变学霸
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
【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.
【简答题】A．stems B．flows C．runs D．streams
【简答题】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。
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