ACCESS窗体中的文本框的值怎么通过字符串变量作为查询的条件?

SELECT 项目明细.省干网传输系统成本, 项目明细.行业IP数据网用户成本, 项目明细.PTN分组传输网用户成本
FROM 项目明细
WHERE (((项目明细.项目批准文号) = [projectID]))
............

Private Sub Form_Load()

projectID = Me.项目批准文号

End Sub

..........

Option Compare Database

Public projectID, uName, pWord As String

运行后提示输入参数“projectID”

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