皮皮学,免费搜题
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【单选题】
液压泵联轴节故障,主要原因是
A.
负荷太大
B.
对中不良
C.
系统油压高
D.
连续工作时间过长
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皮皮学刷刷变学霸
举一反三
【多选题】以下哪些情况需要对废旧制冷剂回收( )
A.
制冷装置发动故障,需要通过拆换零部件或者拆卸零部件维修
B.
制冷装置存在部分泄漏,需要通过气密性实验查找漏点
C.
更换空调进风口滤芯
D.
更换储液罐
【简答题】A.He can't sleep at night. B.He can't find a quiet place to study. C.He can't narrow down his research topic. D.He can't find enough information for his research paper.
【多选题】在以下哪些情况下需要对制动系统排空( ) 。
A.
更换管路
B.
更换制动主缸
C.
更换摩擦片
D.
更换车轮制动器
【判断题】当RLC串联电路发生谐振时,电路中的电流将达到其最大值。串联谐振阻抗最小电流最大,并联谐振相反
A.
正确
B.
错误
【单选题】除 RNA 复制外,属于 RNA 生物合成的还有
A.
半保留复制
B.
半不连续复制
C.
不对称转录
D.
反转录
E.
翻译
【单选题】下述对于LTE帧结构类型1描述错误的是()
A.
每帧长20ms的半帧组成
B.
每帧包括20个时隙
C.
每个时隙长0.5ms
D.
帧结构类型1适用于全双工和半双工FDD模式
【多选题】哪些情况下需要更换制动液
A.
到达规定期限
B.
含水量超过2%
C.
含水量超过4%
D.
每次更换制动摩擦片时
【单选题】In a narrow channel or fairway when overtaking can take place only if the vessel to be over-taken has to take action to permit safe passing, the vessel intending to overtake shall indicate her intenti...
A.
the vessel to be overtaken shall sound appropriate signal first
B.
the overtaking vessel shall sound appropriate signal first
C.
the overtaking vessel shall take action to permit safe passing
D.
the vessel to be overtaken shall take action to permit safe passing before hearing appropriate signal
【单选题】The site is fairly near the city center, ___ it can only be reached by a series of narrow streets
A.
22.The site is fairly near the city center, ___ it can only be reached by a series of narrow streets. A.and
B.
but
C.
or
D.
So
【多选题】下列哪些情况需要进行制动机的简略试验?
A.
更换机车或更换乘务组时
B.
列车软管有分离情况时
C.
列车停留超过 20 min 时
D.
机车改变司机室操纵时
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