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单选题
用振动诊断轴组件的故障,必须能对各类激振频率进行识别,引起轴组件激振的原因()。 Ⅰ.由缺陷引起的; Ⅱ.由结构引起的; Ⅲ.由测试仪器本身缺陷引起的。
A
Ⅰ+Ⅱ
B
Ⅱ+Ⅲ
C
Ⅰ+Ⅲ
D
Ⅰ+Ⅱ+Ⅲ
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