单相半波整流器最大失控时间Tsmax(ms)为()
参考答案:20ms
The recent conference on the effective use of the seas and oceans was another attempt resolving major differences among countries with conflicting interests.
A.resolve
B.resolves
C.to resolve
D.being resolved
朱砂的适应证是()
A.惊风,癫痫
B.心神不安,心悸、失眠
C.肾虚遗精、滑精
D.疮疡肿毒,咽喉肿痛
E.淋证,癃闭