A.1%-2% B.2%-3% C.3%-4% D.5%-7%
A.重心水平處 B.重心在0.2m處 C.重心在1-2m處 D.重心在0.5m處
A.支腿受力不均 B.超負荷、過卷揚 C.變幅不當(dāng) D.報警裝置失靈