V5.X系统中,门磁接在监控模块的DI通道上,一般配置虚拟量表达式取反,虚拟量属于哪种类型?()
A.纯虚拟量
B.一重虚拟量
C.二重虚拟量
D.三重虚拟量
参考答案:A
I feel greatly honored ____ into their society.
A.to welcome
B.welcoming
C.to be welcomed
D.welcomed
I _____ my teacher carefully, but I can't _____ him.[ ]
A. listen, hear
B. hear, listen to
C. listen to, hear
D. hear, listen