主提升机常用联轴器有（）联轴器。
A、齿轮
B、凸缘
C、蛇形弹簧
D、弹簧圈柱销
E、十字滑块
参考答案：A, C, D
Our new laboratory is said ____ instrument made in Shanghai. [ ]
A. to equip with
B. to be equipped with
C. to have equipped with
D. to be equipping with
氨基甲酸酯杀虫剂有什么特点？
