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【单选题】
( )不是 PLC 主机的技术性能范围。A.
本机 I/O 口数量
B.
高速脉冲输出
C.
高速计数输入个数
D.
按钮开关种类
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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【单选题】She could not have believed it, but that she ______ it.
A.
had seen
B.
see
C.
saw
D.
would see