Maybe you have been to many countries, but nowhere else _______ a more beautiful palace.

A．can you find

B．you could find

C．you can find

D．could you find

采用切削叶轮调节时，对于中、高比转数水泵，根据第二切削定律，调节后流量与原流量的比为切削比的（）。

A．一次方

B． 二次方

C．三次方

D．不变化