内置计算函数Sum的功能是()
A.计算所有指定字段值的累加和
B.计算全部数值型字段的累加和
C.计算一条记录中数值型字段的累加和
D.计算一条记录中指定字段的累加和
参考答案:A
As we all know, surfing_____ Internet has now become _____popular means of obtaining information.
A.the; the
B./; the
C.the; a
D./; /
绿系统操纵:().
A.扰流板3
B.扰流板2和4
C.扰流板1和5