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【单选题】
执行指令PLSY K10 K100 Y0，下列说法正确的是（ ）A.
Y0端输出频率为100Hz的脉冲
B.
Y0 端输出频率为 1000Hz 的脉冲
C.
Y0端输出的脉冲占空比为50%
D.
Y0端输出的脉冲个数为10个
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举一反三
【单选题】He didn't want to go to the cinema but they begged so hard that he ______ and went with them.
A.
gave off
B.
gave out
C.
gave in
D.
gave up
【单选题】Why does Jim say this?
A.
He doesn't permit her to work there.
B.
He didn't expect the woman was serious.
C.
He will not help her to work there.
D.
He can't agree with her mor
【简答题】驼峰色灯辅助信号机,可兼作( )或发车进路信号机,并根据需要装设进路表示器
【单选题】The doctor suggested that the patient _____ on a diet but he couldn't resist the temptation of rich food .
A.
goes
B.
go
C.
went
D.
gone
【简答题】A．He likes to go with her. B．He has no time. C．He doesn't feel welt. D．He doesn't like the evening party.
【简答题】食品调味剂分为哪几大类
【单选题】refers to t he pathological process that results in the formation and growth of a tumor.
A.
hyperplasia
B.
neoplasia
C.
hypoplasia
D.
displasia
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