根据水灭火系统工程量计算规则，末端试水装置的安装应包括（ ）。
A．压力表安装
B．控制阀等附件安装
C．连接管安装
D．排水管安装
参考答案：A,B
______I know him, ______I hardly talk to him.
A．Although; but
B．Although; /
C．/; Although
D．But; although
钻孔前，先用百分表找正定心，工具圆锥部分与钻床主轴的同轴度误差在（）之间。
A.0.01~0.02mm
B.0.02~0.03mm
C.0.03~0.04mm
D.0.04~0.05mm
