当一个平衡力系作用在超静定结构的几何不变部分(刚片)上时，在支座处( )。

A．(A) 一定产生支座反力

B．(B) 支座反力等于零

C．(C) 支座反力小于零

D．(D) 上述答案都不对

A．(A) It was predicted that I would be the Guest of Honour at the Show.

B．(B) I had to wait for 20 years before I was invited to the Show.

C．(C) I didn’t expect that I would be the Guest of Honour at the Show.

D．(D) I suspected that I would be given a leading role in the movie.