雄烯二酮
A.人绒毛膜促性腺激素B.人胎盘生乳素C.雌激素D.孕激素E.前列腺素
参考答案:D
The life he is now used _____ quite different from ours.
A.is
B.to be
C.to being
D.to is
静水压强的方向沿受作用面的外法线方向。