皮皮学，免费搜题
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搜题
【单选题】
13 S7-300 PLC可以扩展多达( )个机架,( )个模块。A.
1，7
B.
4，32
C.
4，44
D.
21，300
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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