The only popular belief that Professor McKay is unable to provide evidence against is _______.
A. old-age sickness.
B. loose family ties.
C. poor mental abilities.
D. difficulties in maths.
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软盘插入软盘驱动器后,驱动器的读写就是通过读写窗口存取信息。( )
A. 对
B. 错
以只读方式打开的某一份文档,修改后仍可在原目录中以原文件名进行保存。( )
A. 对
B. 错
采购入库单可由采购发票或采购订单完成。( )
A. 对
B. 错
已有余额的科目不能直接删除。( )
A. 对
B. 错