血液透析用透析液的细菌培养数不得高于()
A.50cfu/ml
B.100cfu/ml
C.200cfu/ml
D.500cfu/ml
E.2000cfu/ml
参考答案:C
John wants to be a , so he often helps sick people in the hospital.
A.reporter
B.doctor
C.scientist
D.cook
四警两标指:警铃、警灯、()。
A.警标
B.警冲标
C.巷标
D.路标