The quicksand at the bottom of the Qiantang River made the construction nearly impossible. T.E.Mao Yisheng figured out the way－－Caisson Method.

The quicksand at the bottom of the Qiantang River made the construction nearly impossible. T.E.Mao Yisheng figured out the way--Caisson Method.
A.正确
B.错误
正确答案：正确