California was forced to adopt this plan because ______.
A.a recent oil crisis necessitated it
B.too many drivers were filling their tanks with more than twenty gallons and spilling it
C.people were not getting enough exercise and need to walk, bike, or skate
D.too many motorists had odd-numbered plates
第5题
A . 实现机车特性控制
B . 实现机车逻辑控制
C . 实现机车故障监视和诊断
D . 实现机车顺序控制
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