在开始动平衡前,试车的目的是()
A.确认车辆是否存在故障
B.了解车况
C.通过试车可以获取有关行驶不平稳的信息
D.注意行驶不平稳的车速区间
参考答案:A, B, C, D
Sending messages by telephone has become _______ second most popular way of exchanging of New Year greetings, according to _____ research by China Daily.
A.the, a
B.the, the
C.a, a
D.a, the
简述四喷嘴对置式干煤粉加压气化技术的优缺点。