竖直角就是在同一竖直面内,______与_________之夹角。
用光学经纬仪测量水平角与竖直角时,度盘与读数指标的关系是________。
竖直角________。
— What would you like to have, meat or fish?
— _____________________.
— ___________________
— Once or twice a week.
免费的网站请分享给朋友吧