单项选择题A decision to position the product on high performance quality will mean that the seller must charge a lower price to cover higher costs. A、True B、False
单项选择题通电延时定时器的SD线圈( )时开始定时,定时时间到,当前时间值为( )。 A. 通电,0 B. 通电,预设值TV C. 断电,0 D. 断电,预设值TV
