【单选题】______ in debt to anyone, Tony is very careful about the loans.
【单选题】Tony's sister spends five hours ______ the piano every day. [ ]
【单选题】航空器上使用的铝合金板材通常是什么类型的材料?
【单选题】The Dreamer type never spends long hours in front of a desk.
【简答题】黑白图像或灰度图像只有1个位平面,彩色图像有个或更多的位平面。