如果需要给当前表增加一个字段，应使用的命令是
A、APPENDB
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Thegeneralsentoutwordthatnooneinthebunker________tobeduntilfurtherorders.
Somepersonsgaingoalanddirectionfromtheirtensions;others________underpressure.
ModernEnglishvocabularydevelopsthroughthefollowingchannelsEXCEPT______.
Thereisadeadlock(僵局)inthediscussionwhenneithersidegives________totheother.
Thebasicunitinthestudyofmorphologyis______.
