发动机失火检测主要通过（）。

A、曲轴位置传感器

B、氧传感器

C、相位传感器

D、爆震传感器

The sufferings of wind power industry in the mid-1980s in the United States could be attributed to the following EXCEPT ______.

A. oil crises of the 1970s
B. the drop of oil prices
C. lack of funding for research into renewable energy
D. loss of interest in wind energy as a widely-used source of energy