The shortcomings of the petrol engine in the nineteenth century include the followings except ______. A. unreliable nature of the ignition system B. very expensive and not efficient enough C. no spark plug is used D. high fire risk caused by petrol(单选题) .A .B .C .D

The shortcomings of the petrol engine in the nineteenth century include the followings except ______.
A. unreliable nature of the ignition system B. very expensive and not efficient enough
C. no spark plug is used D. high fire risk caused by petrol(单选题)
.A
.B
.C
.D

出自：2024年国家开放大学答案

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