A.1.2 B.1.4 C.1.6 D.1.8
A.低壓管網(wǎng)(P≤10kPA. B.中壓管網(wǎng)(10kPA. C.次高壓管網(wǎng)(200kPA. D.高壓管網(wǎng)(300kPA.
A.雙合式樓梯 B.直跑式樓梯 C.輔助式樓梯 D.雙跑式樓梯