单选题On a lifeboat equipped with Rottmer-type releasing gear，turning the releasing lever releases（）.Athe painterBthe after boat fall only if the boat is waterborneCboth falls at the same time only if the boat is waterborneDboth falls at the same time even if the boat has not reached the water
单选题
On a lifeboat equipped with Rottmer-type releasing gear，turning the releasing lever releases（）.
A
the painter
B
the after boat fall only if the boat is waterborne
C
both falls at the same time only if the boat is waterborne
D
both falls at the same time even if the boat has not reached the water
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