When the（）is large, the ship is stiff; and when it is small, she is tender.

A.GM

B.free surface

C.longitudinal center of gravity

D.transverse center of gravity

在双转子发动机中，可调静子叶片一般是调节（）.

A.高压压气机进口导向叶片和前几级静子叶片

B.低压压气机进口导向叶片和静子叶片

C.高压涡轮进口导向叶片和静子叶片

D.低压涡轮进口导向叶片和静子叶片