There are two buildings,            stands nearly a hundred feet high.

A．the larger

B．the larger of them

C．the larger one that

D．the larger of which

性能相同的两台离心泵并联，理论上总流量等于两泵在同一扬程下的流量（）。

A.之和

B.之差

C.乘积

D.比值