通风散热的原理是
A、辐射
B、传导
C、对流
D、蒸发

单项选择题欧洲中世纪以前的丘尼克、近东及伊斯兰文化圈的卡夫坦、我国古代的深衣袍衫以及大部分的民族服装，均属______。

单项选择题The consignment note that a carrier issues under the Convention for the International Carriage of Goods by Road (the CMR Convention) isprima facie evidence of: A、the condition of the goods when received. B、the making of a transport contract. C、the receipt of goods. D、All of the above.