A:8π
B:56π3
C:14π3
D:28π3
“重要的事情说三遍。”can be translated into "Important things must be again and again.”.
水生植
物种类
漂浮
植物
浮叶
沉水植物
紫背浮萍
水鳖
菱
荇菜
金鱼藻
穗花狐尾藻
苦草
马来眼子菜
轮叶黑藻
伊乐藻
采样点
养殖区1
+
++
养殖区2
航道区1
航道区2
表中“+”表示出现,“++”表示优势种
B
From — To
Ways
Cost
Time
Comfortable
Popular
Xizhimen — Beijing Railway Station
Bus
¥1
40 minutes
*
**
Taxi
¥20
10 minutes
***
Subway
¥3
30 minutes
Bike
/
1 hour
London— Paris
Coach
(长途汽车)
£30
7 hours
Plane
£100
1 hour and
15 minutes
Train
£60
3 hours
Ferry
(渡轮)
£45
6 hours
Shanghai — Tianjin
¥280
15 hours
¥1000
2 hours
¥180
20 hours
¥286
14 hours