It is well known that ____ the flower is to grow,____the price is in the market.

A．harder; higher

B．the harder; the higher

C．the more hard ; the more high

D．more harder ; more high

在曲柄摇杆机构中，当曲柄为主动件，且（）共线时，其传动角为最小值。

A.曲柄与连杆；

B.曲柄与机架；

C.摇杆与机架