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【简答题】
已知PLC的输入继电器0000接起动按钮、0001接复位停止按钮，输出继电器0500控制某加热器。要求按一次起动按钮，立即加热且维持2h后自动停止；按下复位停止按钮立即停止。请用定时器0和计数器1配合完成上述程序设计，画出梯形图。
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【单选题】听力原文：M: Will professor Benson ask you to make up your physics exam? W: I don' t know. I' 11 cross that bridge when I come to it. What is the woman planning to do?
A.
Play bridge.
B.
Make up her physics exam.
C.
Wait and see what happens.
D.
Go across the bridge.
【简答题】简述有哪些抽样的方法。
【单选题】Philosophy of Logical Analysis Modern physics and physiology throw a new light upon the ancient problem of perception. If there is to be anything that can be called 'perception', it must be in some de...
A.
he liked to enjoy the California sunshine
B.
he was too busy to care for himself
C.
he was particular about his clothes
D.
he paid no attention to himself
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