【单选题】He shouted to them ___________ the top of his voice but wasn’t heard.
【单选题】单相桥式整流、 电容滤波电路中,设变压器副边电压有效值为U2,则通常取有载的输出电压平均值UO等于( )。
【简答题】纺织材料在常温下具有捕捉静止空气和储存水分及热量的能力,这种能力的大小的衡量可从两个角度来描述?
【单选题】I was ____ he received an invitation from his friend to visit Chongqing ____ he felt on top of the world. [ ]
【单选题】Mum, where is ______? [ ]
【单选题】The captain stood by the window, _____ he could see the top of the tower.
【单选题】-What's this? -_____. [ ]