接地线是综合布线系统的各种设备与接地母线之间的铜连接绝缘导线,其截面积应不小于()
A、16mm2
B、4mm2
C、1mm2
D、6mm2
参考答案:B
Kathy opened her mouth, expecting a candy and then looked puzzled______ she got nothing.
A.when
B.although
C.so
D.Once
陶质卫生陶瓷的吸水率为()。
A.5%~10%
B.8%~10%
C.8%~15%
D.10%~15%