A.3 B.4 C.5 D.6
A.2 B.3 C.4 D.5
A.應(yīng)將網(wǎng)子上下、中間都綁在網(wǎng)柱上 B.網(wǎng)子上下綁在網(wǎng)柱上就可以 C.應(yīng)將網(wǎng)子綁在網(wǎng)柱上,網(wǎng)柱和網(wǎng)之間不能有空隙 D.只要固定在網(wǎng)柱上