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【单选题】
在直流电路的计算中,若选择了某一方向为电流的参考方向。求解出来的电流或电压是正值。则表示参考方向与实际方向( )A.
相同
B.
相反
C.
不一定
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【单选题】在excel2010中,如果在“筛选”中选定了性别中的“男”,于是表中显示的全是男性的数据,则以下说法正确的是()。
A.
本表中性别为“女”的数据全部丢失
B.
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C.
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D.
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【单选题】在Excel2010中,如果在“筛选”中选定了性别中的“男”,于是表中显示的全是男性的数据,则以下说法正确的是( )。
A.
本表中性别为“女”的数据全部丢失
B.
所有性别为“女”的数据暂时隐藏,还可恢复
C.
再次基础上不能做进一步的筛选
D.
筛选只对字符型数据起作用
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