单选题
发布日期:2021-03-22
system was overcharged with refrigerant
high pressure switch was improperly adjusted
expansion valve strainers were fouled
suction valves were leaking slightly
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如果由3个物体组成的系统,每个物体都受平面一般力系的作用,则共可以建立几个独立的平衡方程?
农村信用社员工行为规范的总体要求是什么?
同一车组两人及其以上制动时,由()负责指挥。
在旁正中矢状断面上()。
根据下列材料,请回答某企业三种产品的单位成本和产量资料如下表:[img:LzIwMTctMDUvd2FuZ3l1LzIwMTcwNTExMDk0MjQwNTA4Ni5qcGc=]成本总指数为()。
各种运输单据中,能同时具有货物收据、运输合同和物权凭证作用的是()。
当地基土质较软,不足以承受上部结构重量时,应采用桩基。可以采用预制钢筋混凝土桩、挖孔灌注桩或钢管桩等。桩承台上仍可做成箱形或筏形基础。
对于未办理旅行社责任保险的旅行社,应给予的处罚是( )。
以下客户不允许开立单位账户的是()。
关于射线因素对照片对比度的影响,叙述错误的是( )。
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