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【简答题】
什么是防火墙?防火墙应具有的基本功能是什么?使用防火墙的好处有哪些?
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举一反三
【单选题】Create a variable that is connected to the simulation PLC, and realize that the variable decreases from 100 to 0, and the defined variable type is ( ).
A.
IO integer
B.
IO analog
C.
IO discrete
D.
RAM integer
【简答题】完形填空。 While my friends went away to their universities in great delight, I restarted my senior high school life. My spirits 1 at the prospect of starting all over again. 2 by strange classmates, I fel...
【简答题】根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。 Every student has tests when they are at school. But have you ever been so worried about the tests that you can’t fall asleep at night? Have you ever felt sic...
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