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题图是利用PC实现三相异步电动机正、反转控制以及点动控制的接线图。画出系统的梯形图编程并列出指令语句表。
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【简答题】Why does the UN use the olive branch in its symbol?
【单选题】What can we learn about olive oil?
A.
People started to cook with it recently.
B.
It can be good for health.
C.
It is made from olive branches.
D.
People used it to build ships in Greece.
【单选题】Why was the olive tree broken by the storm?
A.
Because the reed yielded to the wind, but the olive tree received the full force of the wind.
B.
Because this particular olive tree was probably too old and too weak.
C.
Because the olive tree could bend easily.
【单选题】Why was the olive tree broken by the storm and not the reed?
A.
Because the Reed yielded to the wind,but the olive tree received the full force of the wind.
B.
Because this particular olive tree was probably too old or too weak.
C.
Because the olive tree could bend easily.
【简答题】PASSAGE TWO 53. Why does the UN use the olive branch in its symbol?
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