【简答题】玄武湖乘坐快艇是水上娱乐项目.为了保护环境,玄武湖风景区改用乙醇汽油作为快艇的燃料.下表为某种快艇的部分技术参数: 限载 6人 排水量 1.4t 油箱容积 40L 快艇自身质量 1000kg (1)请写出使用乙醇汽油的两点好处? ①______; ②______. (2)为保证安全,快艇上乘客的质量之和不得超过______kg. (3)已知该快艇使用的乙醇汽油热值约为4.6×10 7 J/kg,密...
【单选题】土石坝游坝面如设变坡,相邻坝面坡率差值一般取( )。
【简答题】 Fill in the blanks with the proper words. interview establish contact individual impact respectful sensitive modify convey competence 1. We stay in ____________ by e-mail. 2. The students listened t...
【判断题】涨价是买卖双方交易中不经常发生的事情。如需涨价,卖方应提前通知买方,以便双方协调相关合作问题。又因涨价对买方来说是不利消息,因此告知时应注意语气和方法,尽量委婉。 I’m sorry to say that we have to raise the prices of our products. Unfortunately, we’ve had to slightly raise our pric...
【单选题】We had to slightly modify the original design . prefix = o ns = "urn:schemas-microsoft-com:office:office" /
【单选题】We had to slightly _______ the original design