由于不能回收废酸,所以这个方法是不经济的.This method was uneconomic for it was impossible to recover the spent acid.同时,我们认为,规模不经济对经济增长有一定的负面影响.Un - scale economy has brought a negative effect on the economic growth.这样低的容积率是很不经济的,粗放式的.This r...
Many forest tree species have multiple archegonia which, after fertilization produce a number of proembryos.许多林木树种都有颈卵器, 受精以后便产生许多原胚.A similar section through the female plant reveals several bottle - shape archegonia , ...