男性 * * 分为
A.前列腺部、膜部、阴茎部B.前列腺部、膜部、 * * 球部C.前列腺部、膜部、海绵体部D.前列腺部、膜部、后 * * E.前列腺部、海绵体部
参考答案:C
____, he never seems able to do the work beautifully.
A.Try as he does
B.As he tries
C.Try as does he
D.As try he does
简述润滑油压低保护、连锁过程?