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【简答题】
某工程基坑底的平面尺寸为40.5m×16.5m,底面标高-7.0m(地面标高为±0.500)。已知地下水位面为-3m,土层渗透系数K=18m/d,-14m以下为不透水层,基坑边坡需为1:0.5。拟用射流泵轻型井点降水,其井管长度为6m,滤管长度待定,为38mm;总管直径100mm,每节长4m,与井点管接口的间距为1m。试进行降水设计。
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【单选题】有机溶剂沉淀法是在生物大分子溶液中加入一定量的亲水性有机溶剂，使溶质的溶解度降低而沉淀析出的过程，下列说法错误的是（）。
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A.
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B.
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【单选题】In tests for Pironoma, a serious disease, a false positive result indicates that people have Pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma whe...
A.
The accepted treatment for Pironoma does not have damaging side effects.
B.
The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect Pironoma.
C.
In treating Pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
D.
The proportion of inconclusive test results is equal for all laboratory tests used to detect Pironoma.
E.
All laboratory tests to detect Pironoma have the same proportion of false negative results.
查看完整题目与答案
【单选题】全身动脉血压在80~180mmHg范围内波动时,肾小球滤过率
A.
随动脉血压升高而明显减少
B.
随动脉血压升高而明显增多
C.
随动脉血压降低而明显减少
D.
随动脉血压降低而明显增多
E.
保持相对稳定
查看完整题目与答案
【单选题】动脉血压在80~180mmHg范围内波动时,肾血流量保持不变,这是由于
A.
肾血流量的自身调节
B.
神经调节
C.
体液调节
D.
神经和体液共同调节
E.
神经–体液调节
查看完整题目与答案