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【单选题】
严格执行维修操作规程,故障率降低最明显的是( )。
A.
偶然故障型
B.
人为故障型
C.
耗损故障型
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【判断题】在三相供电系统中,三相交流负载存在星形联结和三角形联结两种形式
A.
正确
B.
错误
【单选题】In drawing up the plan, they went to the library to _____ many books. [     ]
A.
bring up
B.
referr to
C.
look for
D.
try on
【简答题】A.packing up to go abroad. B.Brushing up on her English. C.Drawing up a plan for her English course. D.Applying for a visa to the United States.
【简答题】A.Packing up to go abroad. B.Brushing up on her English. C.Drawing up a plan for her English course. D.Applying for a visa to the United States.
【判断题】( )138.对于实时性要求特别高的控制系统,PLC可以用智能型输入/输出单元或专门的软件指令,通过与扫描周期脱离的方式来解决。
A.
正确
B.
错误
【单选题】普通调幅信号电流的频谱和LC并联谐振回路阻抗的幅频特性和相频特性如图所示,则产生的普通调幅信号为( )。【图片】
A.
u AM = R e I sm [1 + m a cos( W t - p / 4)]cos w c t
B.
u AM = R e I sm (1 + m a cos W t )cos w c t
C.
u AM = R e I sm [1 + 0.707 m a cos( W t - p / 4)]cos w c t
D.
u AM = R e I sm (1 + 0.707 m a cos W t )cos w c t
【简答题】You might just as well tell the manufacturer that male customers ________ not like the design of the furniture. A.must B.shall C.may D.need
【判断题】按照精益生产的哲理,凡是不增加价值的活动都是浪费
A.
正确
B.
错误
【单选题】乘晕宁的主要成分是( )
A.
异丙嗪
B.
苯海拉明
C.
曲吡那敏
D.
氯苯那敏
【单选题】普通调幅信号电流的频谱和LC并联谐振回路阻抗的幅频特性和相频特性如图所示,则产生的普通调幅信号为( )。【图片】
A.
u AM = R e I sm [1 + 0.707 m a cos( W t - p / 4)]cos w c t
B.
u AM = R e I sm (1 + 0.707 m a cos W t )cos w c t
C.
u AM = R e I sm [1 + m a cos( W t - p / 4)]cos w c t
D.
u AM = R e I sm (1 + m a cos W t )cos w c t
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