My mother_____some cakes for us last night. [ ]
A. makes
B. maked
C. made
D. is making
答案:C
通风机按其空气流向与风机主轴的关系可分为轴流式和()两种。
楼层通道门的高度不低于( ),门的下沿离通道面不应超过( )。
A.1.6m,30mmB.1.8m,50mmC.1.7m,40mmD.1.9m,60mm