将字符串"2019010502009"赋值给变量xh,即xh="2019010502009",则left(xh,4)= , Mid(xh,7,2) = ,right(xh,3)=
将字符串"2019010502009"赋值给变量xh,即xh="2019010502009",则left(xh,4)= , Mid(xh,7,2) = ,right(xh,3)=
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将字符串"2019010502009"赋值给变量xh,即xh="2019010502009",则left(xh,4)= , Mid(xh,7,2) = ,right(xh,3)=