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【单选题】
学生a说:柴油汽车由于冒黑烟等原因,应该控制发展;学生b说:柴油机由于燃料消耗低等原因,应该大力发展。他们说法应该是( )。A.
只有学生a正确
B.
只有学生b正确
C.
学生a和b都正确
D.
学生a和b都不正确
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