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【单选题】
下面描述正确的是A.
药源性疾病的实质是药物不良反应的结果
B.
停药后残留在体内的低于最低有效浓度的药物所引起的药物效应称副作用
C.
药物剂量过大，用药时间过长对机体产生的有害作用称副作用
D.
B型不良反应与剂量大小有关
E.
A型不良反应死亡率往往很高
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【单选题】地下室的输水管内径为2.5cm,管内水的流速为0.80m/s,压强为180kPa。如果水从地下室流到高出输入点7.6m的二层楼时,所用管径缩小为1.2cm,那么水到二层楼时的流速和水的压强是:(g=9.8m/ )
A.
流速为 4.78m/s，水压为： 78.3kPa
B.
流速为 2.56m/s，水压为： 101.1kPa
C.
流速为 3.9m/s，水压为： 88kPa
D.
流速为 3.47m/s，水压为： 99.82kPa
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