车的技术参数包括（）。
A.质量参数
B.排量
C.尺寸参数
D.性能参数
参考答案：A, B, C
简述高温环境的优化设计？
There _____ few sheep here, but it was quite different in the past. [ ]
A. is
B. are
C. was
D. were
