自航耙吸式挖泥船处理疏浚泥土的方法属于()。
A.吹填法
B.边抛法
C.水上抛泥法
D.水下抛泥法
参考答案:B
导致唐.明中后期政局混乱的相同原因是()
A.中央 * * 统治无力,豪强地主势力膨胀
B.大规模农民起义爆发
C.民族矛盾尖锐.战争频繁
D.宦官专权,政治黑暗
What is the purpose of tricing pendants?()
A.They have the same function as frapping line
B.They are safety lines for personnel inside the lifeboat
C.They slow the descent of the lifeboat
D.They hold the lifeboat alongside the embarkation deck