在风力发电机组中，常采用（）联轴器、（）联轴器两种方式。
参考答案：刚性；弹性
The teacher wants his students to know more about modern science and tries hard to develop a（n） ___ about nature among his students．
A．curiosity
B．habit
C．ability
D．independence
— Is there anything else I can get for you except the scarf?
— No. That _____ be it. Thanks a lot. [ ]
A. could
B. must
C. should
D. might
