手术后出现尿潴留,导出尿量超过多少时应该留置尿管().
A.300ml
B.500ml
C.600ml
D.800ml
E.1000ml
参考答案:B
—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?
—____ my students have a try?
A.Shall
B.Must
C.Will
D.May
容易碰到的、裸露的带电体,机械外露的转动和传动部分,怎样处理才能确保安全?