When disassembling or assembling an injection pump plunger and barrel you should （）<br>A:keep the parts immersed in diesel fuel<br>B:always keep the plunger and barrel together<br>C:work over a linoleum-type surface<br>D:all of the above

When disassembling or assembling an injection pump plunger and barrel you should （）
A:keep the parts immersed in diesel fuel
B:always keep the plunger and barrel together
C:work over a linoleum-type surface
D:all of the above

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