问题 填空题

我国参照美国工程师协会的粘度分类,规定了内燃机润滑油的()等级。

答案

参考答案:粘度

辨析题

运用所学知识,填写下表(任选4题作答,各简单写出一种理由)

1          理由                                                                                                                                            

2          理由                                                                                                                                            

3          理由                                                                                                                                          

4          理由                                                                                                                                            5          理由                                                                                                                                        

6          理由                                                                                                                                        

多项选择题