【多选题】下面哪些信息可以联合确定化合物中有苯环存在( )
【单选题】听力原文:W: Jack, it doesn't look like you've vacuumed the living room or cleaned the bathroom. M: No, I haven't. I had the worst day. I am so tired. Q: What can we learn from the conversation? (13)
A.
Jack vacuumed the living room but not the bathroom.
B.
Jack cleaned the bathroom but not the living room.
C.
Jack cleaned neither the living room nor the bathroom because he is exhausted.
D.
Jack cleaned both the living room and the bathroom.
【简答题】将曲线 的一般式方程化为参数t的方程____ (约定x用cost表示,y用sint表示)
【判断题】不同的媒体,会使用不同的镜头定义,例如,电影的画面大,定义时不同类型的镜头就多,电视画面小所需要使用的镜头类型就少,通常电影拍摄的镜头类别有 9 种,电视拍摄的镜头类别有 5 种,手机端可能会更小。
【判断题】我国是最大的服装加工基地,服装产业欠缺的不是质量,而是国际品牌。
【单选题】在裱糊工程施工方法中,顶棚裱糊一般采用( )裱糊。
【简答题】将曲线 的一般式方程化为参数t的方程x=____y=____z=____(提示:关于t的写在前面,常数写在后面)
【单选题】—Jack, you look very tired today. —Yes, actually I've been _____ busy these days _____ I can't get enough sleep. [ ]