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【简答题】
用PLC、变频器设计一个刨床的控制系统。其控制要求为,刨床工作台由一台电动机拖动,当刨床在原点位置(原点为与上限位置,车刀在原点位置时,原点指示灯亮)时,按下启动按钮,刨床工作台按照图4-17所示的速度曲线运行。试画出PLC与变频器的接线图,设置变频器的参数并编写PLC程序。
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举一反三
【单选题】The marketplace where short-term debt securities are traded is referred to as ______.
A.
a mortgage market
B.
a stock market
C.
a bond market
D.
a money market
【单选题】According to the expectations theory of the term structure
A.
the interest rate on long-term bonds will exceed the average of short-term interest rates that people expect to occur over the life of the long-term bonds, because of their preference for short-term securities.
B.
interest rates on bonds of different maturities move together over time.
C.
buyers of bonds prefer short-term to long-term bonds.
D.
buyers require an additional incentive to hold long-term bonds.
【判断题】The term money market is actually a misnomer, because liquid securities are traded in these markets rather than money.
A.
正确
B.
错误
【简答题】酒品风格主要从色、( )、味、( )四个方面进行品评。
【单选题】-- Do you want the window or the aisle? -- I’d like _____________ please. I heard the mountains are beautiful.
A.
the aisle
B.
the window
【单选题】An aisle is ________.
A.
a narrow area between rows of seats
B.
an area at the front of a classroom
【单选题】下列事件: (1)口袋里有伍角、壹角、壹元的硬币若干枚,随机地摸出一枚是壹角; (2)在标准大气压下,水在90°C沸腾; (3)射击运动员射击一次命中10环; (4)同时掷两颗骰子,出现的点数之和不超过12. 其中是随机事件的有 ( )
A.
(1)
B.
(1)(2)
C.
(1)(3)
D.
(2)(4)
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