分配阀安全阀正常运行的整定压力为()kPa。
A、350±10
B、400±10
C、450±10
D、600±10
参考答案:C
The foreiger knows little about ______ is called "Hope Project" in China.
A.what
B.that
C.which
D.it
"血府"是指()
A.心
B.肝
C.脾
D.脉
E.冲脉