The Foreign Minister said,“_______ our hope that the two sides will work towards peace.”

A．This is

B．There is

C．That is

D．It is

当发现液压牛头刨床不能迅速启动时，首先应检查（）的故障。

A、制动阀

B、球形阀

C、阻力阀

D、溢流阀