空冷风机启动后必须保证空冷岛各排散热器端部小门以及同一排中各冷却单元的隔离门在（）位置。
参考答案：关闭
In relation to company law, explain the major rules that are meant to preserve the share capital structure of the company. (10 marks)
多色圆压平式印刷机的电机为整机运转的动力输出，由三角（）传动。
A.齿轮
B.对辊
C.链条
D.皮带
