The fog is lifted，so（）the radar．

A.only after two hours in the water
B.only after four hours in the water
C.before entry into the water
D.upon entry into the water

A.when approved by the lockmaster
B.when locking downbound
C.at no time
D.during high water only

A.it increases the likelihood of collision between the towing vessel and the disabled vessel
B.recreational boaters tend to make the heaving line fast to the towed vessel as if it were the towline
C.the monkey fist may injure someone
D.it may reduce the catenary and increase yawing