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【单选题】
在PLC编程时,置位指令SET驱动线圈,具有自锁功能;而( )为复位指令。A.
RST
B.
SET
C.
LD
D.
OUT
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【简答题】What is renewable energy? Renewable energy is energy that is environment -friendly because it is collected from renewable resources, which are naturally replenish ed. Examples of these renewable resou...
【简答题】Every human being, no matter what he is doing, gives off body heat. The usual problem is how to dispose of it. But the designers of the Johnstown Campus of the University of Pittsburgh set themselves...
【单选题】What is heat, which causes a change in the state of a material without a change in temperature, called________
A.
Latent heat
B.
Sensible heat
C.
Superheat
D.
Regular heat
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