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【单选题】
用于 WinCC 与自动化系统之间通信的变量称为A.
内部变量
B.
过程变量
C.
系统变量
D.
变量组
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
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【单选题】关于皮下注射的操作方法,错误的是
A.
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B.
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C.
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D.
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E.
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