2. The classroom area is about 48 square meters, and the capacity of a thermos bottle is 1.5 liter.
The total length of the Yangtze River is about 6300 kilometers.
Xiao Ming weighs about 40 (kg) and the volume of a piece of chalk is about 7 (cm 3).
It takes about 5 minutes to walk around the playground, about 5 seconds to walk from the front door to the back door of the class, and about 2 hours from Taiyuan to Shijiazhuang after the train speeds up.
6.8m？ =(8000)dm？ =(8000000)cm？ 3.08 tons = 3 tons (80) kg
7. In descending order
( 1) 65g 0.65kg 0.0065t
= 0.0065t > 0.65kg > 65g.
(2) 6.3 cubic meters, 6 cubic meters, 3 cubic decimeters and 630 cubic decimeters.
= 6.3 cubic meters > 6 cubic meters, 3 cubic decimeters > 630 cubic decimeters.
(3)8 hours and 30 minutes, 9 hours and 8.3 hours
=9 hours > 8 hours, 30 minutes > 8.3 hours
8. The distance between A and B is 1380km, and there is a train from A to B at 5: 30 pm. The train runs at an average speed of 60 kilometers per hour. What time does it arrive in B?
1380/60=23 hours 5: 30 +23 hours = 4: 30 pm the next day.
9. The volume of a cube is 1m? Its side length is (a), and the area of one of its faces is (c)
a . 1m b . 10m c . 1㎡d . 10㎡
1On the evening of May 6th, 1 1: 50, a TV station began to broadcast the football match, with * * * broadcast 1 10 minutes. What time does the broadcast end?
1 10 minutes =65438+ 0 hour and 50 minutes in the evening10 hour and 50 minutes+1 hour and 50 minutes = 65438+ 0 hour and 40 minutes the next morning.
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