U形弯可替代两个()弯头,经常用来连接上下配置的两个圆翼形散热器。
参考答案:90度
In China, the number of cities is increasing ________ development is recognized across the world.[ ]
A.where
B.which
C.whose
D.that
简述葡萄胎患者刮宫术后采取预防性化疗的指征。