A.-- traffic volume B.-- traffic jam C.-- traffic accident D.-- traffic regulations E.-- traffic control F.-- traffic signal G.-

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问题 A.-- traffic volume
B.-- traffic jam
C.-- traffic accident
D.-- traffic regulations
E.-- traffic control
F.-- traffic signal
G.-- traffic safety
H.-- police stand
I.-- traffic police
J.-- double-decker
K.-- police box
L.-- collision
M.-- one way traffic
N

选项

答案A、D

解析
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