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【单选题】

将所有装有不同金属螺套或有较深盲孔的金属零件在烤箱中干燥至少一小时,烤箱温度为225到275 华氏度(107 tol35C).

A.
Dry all metal parts that have different metal inserts or deep blind holes in an oven at 225 to 275F(107 to 135C) for a minimum of one hour.
B.
Put all different metal inserts or deep blind holes metal parts in an oven at 225 to 275F(1070to 135C) for a maximum of one hour.
C.
All metal parts that have different metal inserts or deep blind holes are dry in an oven of 225 to 275F(107 to 135 C) for a minimum of one hour.
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举一反三

【单选题】接头联结零件是用来联结()间接头的零件。

A.
钢轨与钢轨
B.
轨枕与轨枕
C.
钢轨与轨枕
D.
轨枕与道床

【单选题】可在高精度研磨平板上手工研磨修复______的零件。

A.
尺寸较小、要求较高
B.
尺寸较小、要求不高
C.
硬度较低、易研磨
D.
发生磨损或腐蚀