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【单选题】
不属于变频器的定期维护项目的是（）。A.
对紧件进行必要的紧固
B.
清扫冷却系统积尘
C.
检查电源电压是否在允许范围内
D.
检查冷却风扇、滤波电容器的工作情况
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反馈参考答案：
举一反三
【单选题】Task 22 Falls are the number one cause of death to old people at home. Most old people can live safely at home if they make a few changes. Falls are common as people are getting older. Up to half of h...
A.
are free from home accidents
B.
can improve their health
C.
are likely to live longer
D.
can live more safety
【简答题】Falls are the number one cause of death to old people at home. Most old people can live safely at home if they make a few changes. Falls are common as people are getting older. Up to half of home acci...
【简答题】Falls are the number one cause of accidental deaths in the home every year. (翻译成中文)
【单选题】Passage 1 Falls are the number one cause of death to old people at home. Most old people can live safely at home if they make a few changes. Falls are common as people are getting older. Up to half o...
A.
are free from home accidents
B.
can improve their health
C.
are likely to live longer
D.
can live more safely
【简答题】( )是海岸线变化的地带,是海陆交互作用的地方。
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