低压电网实行分级保护时,上级保护应选用延时型剩余电流动作保护器。其分断时间应比下级保护器的动作时间增加()以上。
A.0.1s
B.0.2s
C.0.3s
D.0.4s
参考答案:B
_______ , I lost heart in English learning, but my teacher often said to me, “Keep on working hard and you’ll succeed ”.
A.At a time, in time
B.At a time, on time
C.At one time, in time
D.At one time, on time
综合考虑药物应用的因素应除外()
A.全面考虑生理特点
B.所患疾病的种类
C.病情的严重程度
D.新生儿用药剂量一样
E.同种药物治疗不同疾病的剂量有较大差异