【单选题】关于汽车点火系统的保养方法,以下描述正确的是:
A.
对火花塞中心电极燃烧状态检查,发现颜色发黑,一定是混合气过浓,不必更换
B.
更换火花塞型号的依据是之前安装的型号,必须保持和更换前一致
D.
随着发动机运行,火花塞间隙会逐渐增大,达到规定保养里程必须更换
【简答题】Listen to the recording and fill in the blanks with the words you hear. In the past, Brazilian family sizes were much ____1____ than today. In the 1990s, family size suddenly ____2____. What is ____3_...
【简答题】判断下列句中划线部分数字的书写形式是否正确,若正确请填写T,若错误请填写正确写法。 1. This distance is about five trillion eight hundred sy-eight billion miles. 2. A light-year is a unit of length equal to the distance that light travel...