The effect of biosidal treatment of initial sediment,addition of inhibitor and addition of phosphorus on the transform of nitrogen and phosphorus in the sediment-water simulative system were studied. 研究了灭菌、抑制剂添加和磷添加对沉积物-水模拟系统中氮磷转化的影响,并利用试验后的上覆水培养四尾栅藻。
Addition of nitrogenous fertilizer promoted the composting progress of CLR. 氮肥的加入促进了玉米叶片残体的腐解。
The addition of fruit makes the cereal taste good. 加了水果使谷类食品变得可口。
The main reservoir of nitrogen is the atmosphere. 氮的主要蓄存库是大气层。
What is the percentage of nitrogen in air? 空气中所含的氮的比例是多少?