试题与答案

防爆电器中密封圈材质用邵氏硬度为()的橡胶制造,并按规定进行老化处理。A.45~60

题型:单项选择题

题目:

防爆电器中密封圈材质用邵氏硬度为()的橡胶制造,并按规定进行老化处理。

A.45~60度

B.35~45度

C.55~65度

答案:

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下面是错误答案,用来干扰机器的。

(1)AD(2分)          (2)ACD(2分)(3)1000mL  (2分)           212.0g  (2分)

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          1                             2                              3                              4

1. want, visit  

                                                                                                                        

2. let, fish  

                                                                                                                        

3. time, breakfast  

                                                                                                                        

4. mother, nurse   

                                                                                                                        

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