单项选择题
Tripping defects in anchors frequently occur in（）.
A.deep water B.shallow water C.stiff soils D.soft soils
单项选择题 To reduce mild fever the MOST useful drug is（）.
单项选择题 To prevent a wooden hull from leaking you caulk it（）.
单项选择题 To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is（）.
