对重的作用是()
A.平衡轿厢重量
B.减少能量消耗
C.构成合适的曳引力
D.提高电梯速度
参考答案:A, B, C
Though_____ money, his parents managed to send him to university. [ ]
A. lacked
B. lacking
C. lacking of
D. lacked in
下列哪种结膜炎不易形成假膜()
A.β溶血性链球菌性结膜炎
B.单纯病毒性结膜炎
C.白喉杆菌性结膜炎
D.包涵体性结膜炎
E.流行性结膜炎