如需导尿时,第一次放尿不应超过()。
A.1200ml
B.1000ml
C.800ml
D.600ml
E.400ml
参考答案:B
Internet users are warned to be ________ about giving away personal information to strangers.
A.cautious
B.anxious
C.particular
D.sensitive
同步检测继电器是比较两侧电源的()
A.电压的相位;
B.相序;
C.电流相位;
D.频率。