The new law states that people _________ drive after drinking alcohol.

A．wouldn't

B．needn't

C．won't

D．mustn't

配气相位角是指进、排气门开启、关闭与曲轴转角的对应关系，进气提前角一般为（）。

A、10°～30°

B、30°～50°

C、40°～60°

D、20°～40°