【单选题】乙醇与浓硫酸在 170 °C 时脱水反应的产物是
【简答题】He was born in York, but he considers London his _____________since he's lived there most of his life.
【简答题】脱水反应:醇在浓硫酸催化下可发生分子内脱水,与分子间脱水。乙醇在170°C反应生成(),在140°C时反应生成()。
【单选题】与运动调节有关的黑质-纹状体通路的递质是
【单选题】Stan tends to be driven by his —— he rarely considers the consequences of his actions.
【判断题】排水设施所用的石料,应有较高的抗压强度,良好的抗水性、抗冻性和抗风化性。
【单选题】Stan tends to be driven by his______---he rarely considers the consequences of his actions.
【单选题】与运动调节有关的黑质-纹状体通路的递质是