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有一窗体，"txt1"文本框绑定"商品"表的"单价"字段，"txt2"文本框绑定"数量"字段。设&q
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A、=txt1*txt2
B、=[txt1]*[txt2]
C、="txt1"*"txt2"
D、='txt1'*'txt2'
参考答案:
A、=txt1*txt2
B、=[txt1]*[txt2]
C、="txt1"*"txt2"
D、='txt1'*'txt2'
参考答案: