地漏应安装在地面最低处，其箅子顶面应低于设置处地面______mm。
A．20
B．10
C．5
D．2
参考答案：C
血栓收缩蛋白( )
A．参与止血过程B．参与凝集过程C．参与纤溶激活过程D．参与纤溶抑制过程E．参与抗凝过程
The energy gained from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.
A．precede
B．proceed
C．progress
D．practice
