单项选择题
【单选题】主视图是半剖视图，正确的是（ ）。
单项选择题 The five purposes of smart cities include _____.
单项选择题 【单选题】TPC7062 触摸屏电源为:( )
未知题型 【判断题】Connotation of a word is its actual meaning as defined in the dictionary definition.
