影响发动机散热的因素有哪些?
参考答案:
有水锈、污垢层,气缸壁、散热器管壁的薄厚,面积和它的传热系数、还有冷却水的循环速度,外界空气的温度,以及外界空气流过散热器的速度。
"Could we put off the meeting?" she asked.
"___________,"he answered politely. This is the only day everyone is available.
A.Not likely
B.Not exactly
C.Not nearly
D.Not really
()负责电网调度运行管理和变电设备运行集中监控
A.大运行;
B.大检修;
C.大建设;
D.大规划。