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单选题
222.If you are not sure if the unit is serviceable, do a standard serviceability test ( )
A
If you have no doubt about the serviceability of the unit perform a standard serviceability test.
B
If you have no knowledge about the serviceability of the unit do a standard serviceability test.
C
If there are doubts about the serviceability of the unit, carry out a standard serviceability test.
答案解析
正确答案：C
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