问题 填空题

曲轴顺时针旋转时,活塞下行靠前,上行靠后是连杆();反之活塞下行靠后,上行靠前是连杆()。

答案

参考答案:正扭;反扭

辨析题

外国的节日比中国的节日好。 

                                                                                                                                                                

                                                                                                                                                                

                                                                                                                                                                

                                                                                                                                                               

                                                                                                                                                               

                                                                                                                                                                

填空题