肾前性急性肾衰竭的病因是（）
A.汞中毒
B.急性肾小球肾炎
C.肾血栓形成
D.休克
E.输尿管结石
参考答案：D
— I feel a bit hungry now.
— Why not _____ for dinner with us?[ ]
A. go
B. did you go
C. to go
D. do you go
将20.000g Na2CO3准确配制成1L溶液，其物质的量浓度c(Na2CO3)=0.1886mol/L。[M(Na2CO3)=106g/mol]( )
