以下阀门及附件中,不需要水流方向的永久性标志有()。
A、水泵接合器
B、止回阀
C、泄压阀
D、截止阀
参考答案:D
He always asks _______ questions! I don't like him at all.[ ]
A. too many
B. too much
C. many too
D. much too
纠纷化解制度要求化解纠纷的程序必须正当,程序正当包括哪些内容?