在word的编辑状态,执行“文件”菜单中的“保存”命令后______
A、将所有打开的文档存盘B
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计算二重积分dDxy,其中区域D为曲线r1cos0与极轴围成.
微分方程的特解可设为()
Theaddressbook________theemailaddressesofyourfriendsorgroupsofcolleagues.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Forthenewcountrytosurvive,________foritspeopletoenjoyprosperity,neweconomicpolicieswillberequired.