叙述发动机的起动程序?
参考答案:
1.合上电瓶开关
2.插上钥匙并转动到通电位置
3.将档位手柄放在空位
4.预热
5.启动
Along with the letter was his promise ____ he would visit me this coming Christmas. [ ]
A. which
B. that
C. what
D. whether
光纤具有很低的损耗特征,因此不管怎样折、绕、弯曲半径多小,损耗都不大。()