The car runs from Nanjing to Shanghai 274 km away, with an average speed of 80 km an hour Find the functional relationship between the distance s (km) and the travel time t (H) of the car from Shanghai, write out the value range of the independent variable, and draw the image of the function
S=274-80t
The value range of T is 0
Which objects are 1 km 1 m 1 decimeter 1 cm 1 mm long
One kilometer road, one meter ruler, one decimeter pen, one centimeter finger clip, one millimeter nail thickness