辅助通风机吸入风流中的瓦斯浓度不得超过（），有专人经常检查。
A.0.5％
B.1.0％
C.1.5％
D.2％
参考答案：A
以下自定义数据类型的语句中，正确的是( )。
A) Type student ID As String * 20 name As String * 10 age As Integer End studentB) Type student ID As String * 20 name As String * 10 age As Integer End TypeC) Type student ID As String name As String age As Integer End studentD) Type ID As String * 20 name As String * 10 age As Integer End Type student
上行下给式
