当肾病患者的血浆尿素氮和肌酐开始升高时，内生肌酐清除率至少降_爱下问搜题

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问题单项选择题

当肾病患者的血浆尿素氮和肌酐开始升高时，内生肌酐清除率至少降低（）

A.10％

B.50％

C.30％

D.40％

E.20％

答案

参考答案：B

解答题

设a是实数，f(x)=a-

(x∈R)．
（1）当f（x）为奇函数时，求a的值；
（2）证明：对于任意a，f（x）在R上为增函数．

选择题

All the club members _____ the floor when they heard someone _____ for help.[ ]

A. swept; were shouting

B. swept; shouted

C. were sweeping; shouting

D. were sweeping; shouted