下列何因素与癫狂发生关系不密切
A．七情内伤
B．感受外邪
C．饮食失节
D．体虚劳倦
E．先天不足
参考答案：B,D
(2012·辽宁)The newcomer went to the library the other day and searched for ________ he could find about Mark Twain.
A．wherever
B．however
C．whatever
D．whichever
低压侧工作接地电阻值不宜超过（）Ω。
A、4
B、10
C、20
D、30
