The degree of vertex D is if it is an indegree or outdegree, it is 1 degree in vertex D.
Guangzhou 113°E 23°N
shanghai 121°E 31°N
so the direction is northeast
A car was invented to run on only water and nothing else so that the air pollution can be decreased because then no smoke would come out of the exhaust.
I think the answer is c but its between a and c
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