下列哪一项与子宫内膜癌超声鉴别诊断无关()
A.子宫肌瘤变性
B.绒毛膜上皮癌
C.子宫颈囊肿
D.子宫平滑肌肉瘤
E.多发性子宫肌瘤
参考答案:C
There has been a positive response to the export promotion, ______ ( )
A.hasn't it
B.hasn't there
C.doesn't it
D.has there
在Visual FoxPro中,主关键字的值不能为 【21】 。