测微仪和扭簧比较仪都属于（）。
A.标准量具
B.极限量规
C.机械指示式量具
参考答案：C
The house_____ there will be his new home but we don't know when it will be finished. [ ]
A.built
B. being built
C. is being built
D. to be built
美苏争霸期间，两国力量此消彼长、相互制衡。下列表明苏联退缩的史实是
A．结束越南战争
B．执行“莫洛托夫计划”
C．撤出古巴导弹
D．签订《华沙条约》
