锅炉的水压试验检验周期一般为( )。
A．每年进行1次 B．每年进行2次C．每2年进行1次 D．每6年进行1次
参考答案：D
Can you tell me ________ the problem of stress?
A．what I should deal with
B．how I should do with
C．what to deal with
D．how to deal with
铅白( ) A．24 B．25 C．39 D．22
