Some communicable diseases are transmitted only through the agency of insects.某些传染病只通过昆虫来传播.Some communicable diseases are transmitted only through the agency of vermin or insects.某些传染病只通过害虫和昆虫来传播.Communicable diseases h...
用防风雨的帆布背包装照相机和镜头。Use a weatherproof rucksack to carry your camera and lenses around in.她小心翼翼地在红帆布垫上坐下，膝盖矜持地并拢着。She sat down cautiously on the red canvas cushions, knees modestly together.主帆是用真正的厚篷帆布手工裁剪和缝纫而成的。The mainsai...
The design calculation of heat exchanging system in carbonizing tower are introduced.着重介绍了碳化塔换热系统的设计计算.OBJECTIVE To investigate a quality control method for the carbonizing process.目的:寻找中药炒炭存性的质控手段.There are different ca...