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【单选题】
FX2N系列PLC中,S表示()继电器。A.
状态
B.
辅助继电器
C.
指针
D.
特殊位
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举一反三
【简答题】二氧化硒氧化烯丙位生成烯丙醇属于 机理。
【单选题】Peter wishes that he ___ law instead of literature when he was in college.
A.
studied
B.
had studied
C.
could study
D.
would study
【单选题】Peter wishes that he______ law instead of literature when he was in college.
A.
had studied
B.
studied
C.
could study
D.
would study
【单选题】Peter wishes that he _____ law instead of literature when he was in college.
A.
had studied
B.
would study
C.
studied
D.
could study
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