联轴器有哪些种类？
参考答案：
联轴器有联轴节和离合器两大类。
If you run _____ two rabbits at a time, there's a good possibility that you can catch
neither.[ ]
A. into
B. across
C. after
D. with
出生时存在且永不消失的反射是（）
A.巴彬斯基征
B.颈肢反射
C.吸吮反射
D.吞咽反射
E.提睾反射
