问题 多项选择题

冷轧带肋钢筋按强度可分为()

A、450级

B、550级别

C、650级别

D、850级

答案

参考答案:B, C, D

问答题

新民主主义革命时期,国共两党两度合作。两次合作的主要任务是什么?并分别说明两次合作的结果。

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

问答题 简答题