单相变压器一次侧高压熔断器熔断一相低压侧电压()。
A、低压侧无电压
B、低压侧有电压
C、低压侧有一相无电压
参考答案:A
下列抗结核药物,哪项是不常用的
A.利福平
B.乙胺丁醇
C.链霉素
D.庆大霉素
E.异烟肼
All the people in the nation can remember exactly how many years ago _______ the civil war broke out.
A.was it that
B.it was when
C.it was that
D.was it when