Preparation of salicylic hydrazide . Controlling material mole ratio and the product recrystallization is the key.
水杨 酰肼的制备控制原料的摩尔比、产物的重结晶是关键.
Perhaps the ratio of her fatigue-induced mistake to success crept up during the match.
也许在比赛中,她的疲劳所致失误与成功之比悄然上升了。
Speed down ratio: output speed compare with input speed.
减速比: 输入转速与输出转速之比.
简答网 · 英语词汇