按照联轴器有无弹性元件、对各种相同位移有无补偿能力,即能否在发生相对位移条件下保持连接功能以及联轴器的用途等划分,联轴器可分为刚性联轴器,挠性联轴器和安全联轴器。
参考答案:对
— Why didn't you go to the dance last night?
— If I _____ tired, I would have. [ ]
A. were not
B. hadn't
C. haven't been
D. hadn't been
患者男,35岁,缺失,做基牙,行可摘局部义齿修复
制备铸造支托凹,其颊舌径宽度约为()
A.颊舌径的1/2
B.颊舌径的2/3
C.颊舌径的1/4
D.颊舌径的1/3
E.颊舌径的1/5