腰部冷痛沉重，阴雨天加重的临床意义是（）。
A.肾虚
B.寒湿
C.瘀血阻络
D.结石阻滞
E.带脉损伤
参考答案：B
The woman proceeded gently to tickle that withered chin of seventy, much as it had been that of a four- or five-year old child.
A. much as if it was that B. much as though it were thatC. much as though it has been that D. much as though it had been that
个别设备、局部采用双重绝缘或加强绝缘的电气设备(即Ⅱ级设备)、采取电气隔离措施以及采用( )安全超低压设备，均可代替接地故障保护用于防人身间接电击。
A．25V及以上
B．30V及以上
C．50V及以下
D．50V及以上
