采油树卡箍钢圈刺漏时从（）中渗漏油污、水，严重时刺油、水。
A、法兰
B、阀门
C、卡箍
D、压盖
参考答案：C
It is ______ any wonder that his friend doesn’t like watching television much.
A．no
B．such
C．nearly
D．hardly
怎样正确使用热电阻？
