与氰氢酸的加成是碱催化的.The addition reaction with hydrogen cyanide is base - catalysed.在国内开辟了多氢酸应用的新篇章,多氢酸在国内油田将拥有广阔的应用前景.The application of the acid in China oil fields has a wonderful prospect....
The firing finally began to die away in the late afternoon.到了临近傍晚时枪炮声终于渐渐停息。The daily and yearly temperature oscillations die away at depths less than 1 m and 30 m respectively.温度日变化波及的深度小于1米,而温度年变化影响的深度约30米.The rain wil...
He took my hand to help me over a boulder that blocked the way.他牵着我的手带我爬过那块挡道的卵石。A flowing stream inarms a boulder in its passing.流水围绕大石流过去....a huge boulder with rare ferns growing in every crevice.裂缝中全长着罕见蕨类植物的巨石Roger ...