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[问答题] 电梯的保养中,应对哪些主要部件和内容进行定期和不定期保养?

下列关于记账式国债的收费正确的有() ["记账式国债开户费:10元\/笔","记账式国债转托管:20元\/笔","记账式国债非交易过户:50元\/笔","记账式国债历史交易查询:5元\/笔"] 列植在园林绿化中使用较为广泛,多用于() ["行道树","绿篱","防护林带","水边"] Yet a euphoric approach to business is()enough. ["by all means","by means of","by no means","by means for"] 核定管理:核定权限管理中,可以设置的角色有() ["审定","初审","初核","无"] PQR10A型控制屏转子电路中的电阻含有() ["两级反接制动电阻,四级加速电阻","四级反接制动电阻,三级加速电阻和一级软化电阻","两级反接制动电阻,四级加速电阻和一级软化电阻"] 电梯的保养中,应对哪些主要部件和内容进行定期和不定期保养?
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