对火灾初期有阴燃阶段,产生大量的烟和少量的热,很少或没有火焰辐射的场所,应选择( )探测器。
A.感温 B.感烟 C.感光 D.火焰
参考答案:B
为什么发挥自觉能动性是认识和利用客观规律的必要条件?
下列程序的执行结果为 Private Sub Command1_Click( ) Dim FirStr As String FirSt = "abcdef" Print Pat(FirStr) End SubPrivate Function Pat( xStr As String) As StringDim tempStr As String, strLen As Integer tempStr ="" strLen = Len(xStr) i=1 Do While i<=Len(xStr)-3 tempStr = tempStr + Mid(xStr, i, 1 ) + Mid(xStr, strLen - i + 1, 1 ) i=i+1 Loop Pat = tempStrEnd Function
A.abcdef
B.afbecd
C.fedcba
D.defabc