属于减升装置的辅助操纵面是()
A.扰流扳
B.副冀
C.前缘缝翼
参考答案:A
When _____ the prices of these goods, we must take everything into consideration.
A.compared
B.comparing
C.to compare
D.compare
子宫脱垂病因不包括()
A.分娩损伤
B.产褥期过度劳累
C.腹压增加
D.早婚
E.卵巢功能衰退