利用重力、离心力使药液形成薄膜或使药液剧烈沸腾产生大量泡沫而进行蒸发的浓缩方法为()
A.减压蒸发
B.加压蒸发
C.薄膜蒸发
D.常压蒸发
E.多效蒸发
参考答案:C
三角形面积一定时,如果三角形的底边增大,则这条底边上的高将______.
Seeing the enemy, Gary was behaving as though nothing .
A.happened
B.had happened
C.would happen
D.was happening