每吨煤平均含30公斤氮.Every tonne of coal contains, on average, 30 kilograms of nitrogen.植物需要氮以便制造蛋白质.The plant requires nitrogen in order to make proteins.空气中所含的氮的比例是多少?What is the percentage of nitrogen in air?...
She looked at the books jammed haphazardly in the shelves.她看着乱七八糟地塞在书架上的那些书。I have to find a convenient location for the shelves.我得找一合适的地方放这些书架。Six stale loaves of brown bread formed a dark blot on the otherwise barren s...
Micro - landform and micro - climate could exert great influence on conductor icing.微地形微气候对导线覆冰有很重大的影响.Condition of special landform, grade water natural resources, suit piscatorial development.非凡的地形 、 优质的水资源条件, 适合渔业的发展....