问题 单项选择题

尺寸链中在装配过程或加工过程中最后形成的环是()。

A.封闭环

B.组成环

C.补偿环

D.增环

答案

参考答案:A

问答题

抗日战争胜利的原因和意义分别是什么?

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                              

                                                                                                                                                             

单项选择题