题目内容
（请给出正确答案）
[主观题]
Wood, coal, oil and gas are different kinds of ______. A. chemical B. food C. object D. f
Wood, coal, oil and gas are different kinds of ______.
A. chemical B. food C. object D. fuel
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A．电源电压不稳定或经常断电引起的故障
B． 部件之间接触不良引起的故障
C． 由CMOS引起的故障
D． 人为的故障
