感染率的指标常用于（）
A.急性传染病
B.慢性病
C.隐性感染较多的疾病
D.精神病
E.病毒性疾病
参考答案：C
If he ______ his legs in the last training, he ______ in the coming World Cup, which he has been longing
to compete in.[ ]
A. hadn't hurt; would join
B. didn't hurt; would have joined
C. didn't hurt; would join
D. hadn't hurt; would have joined
瞬时电流速断保护不但保护线路首段，而且能保护线路全长。( )
