研究法辛烷值表示()时汽油的抗爆性能。
参考答案:低转速
According to Li Shangfu, ______ director of the Xichang Satellite Launch Center, ______ launch of China’s first lunar probe Chang’e-1 was ______ success.
A. a; /; the
B. the; the; /
C. /; the; a
D. /; a; a