单选题
1分
In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should be taken off...
In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should be taken off and the piston should be ____ .
参考答案: B
参考解析: 为了彻底地检查活塞及缸壁,应拆卸缸盖,吊出活塞