下面可以正确定义两个整型变量和—个字符串变量的语句是______。

A．Dim n,m As Integer,s As String

B．Dim a%,b$,c As String

C．Dim a As Integer,b,c As String

D．Dim x%,y As Integer,z As String

各重要岗位还应做好治安保卫工作，外来人员要详细（）。

A.查看

B.打听

C.登记

D.随意进