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【单选题】
程控交换机馈电电压为( )。A.
-40V;
B.
48V;
C.
-48V;
D.
~18。
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
举一反三
【简答题】当鼠标指针移到工作表中选定区域的填充柄上时，指针变为 形。
【多选题】Championship events include Nordic skiing's three disciplines:__________ , ____________ , and ____________.
A.
cross-country skiing
B.
alpine skiing
C.
ski jumping
D.
Nordic combined
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【简答题】The tennis player had _______ all the major tennis s before she defeated her opponents and won the championship.
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