【简答题】在R-L-C串联电路中,R=30Ω,XL=30Ω,XC=30Ω,Z=______Ω。
【单选题】在R,L串联电路中,若R=30Ω,XL=40Ω,则电路的阻抗值为()
【判断题】液控单向阀:当控制口工作时,可实现油液双向流动。
【单选题】电视片《楠溪江》结尾有两只鹅在水边戏水的镜头,在鹅低头的一刹那定格,并大厨字幕“欢迎”,重复三次,像是鹅在给观众鞠躬表示欢迎,这时字幕的作用是( )。
【判断题】半球形插花作品的五点定位法,是将5枝同样长度的玫瑰插入花泥,在花器的中央、前后、左右,作为主轴,定出桌花的长、宽、高。底边的花材从侧面看,成水平,俯视看,成十字状。
【简答题】Perhaps a parent’s most important contribution toward raising a trustful child is to develop a relationship founded on trust. A child of any age will feel proud and grown-up if parents frequently show...
【简答题】阅读 Contribute your idea to help the poor children who want to study in China A:Hi, everyone.There was an old topic which has gone now about the possible contribution to help the poor family or childre...