钻芯法按自然干燥状态进行试验时，芯样试件在受压前，应在室内自然干燥( )d。
A．1
B．2
C．3
D．5
参考答案：C
如果3a-b=0，那么a和b成反比例关系．______．
In relation to corporate governance:
(b) Explain non-executive directors and describe their responsibilities. (2 marks)
