【单选题】采用兰勃特正形投影,标准纬圈选择30°N和60°N时,在这两个纬圈上,其缩放系数( )
【单选题】The climate in Beijing is colder than ________ in winter.
B.
the climate in Shanghai
【单选题】The climate in London is quite pleasant, the temperature rarely, ifany, ________ 30 ℃ .
【判断题】电路的主要功能就是对电能进行传输 、分配、存储和转换等。