[单选题]气缸盖底面在较高的()等的恶劣条件下工作。Ⅰ.交变的机械负荷;Ⅱ.热负荷;Ⅲ.燃气腐蚀阀、孔;Ⅳ.冲刷;Ⅴ.冲击。
正确答案 :A
Ⅰ+Ⅱ+Ⅲ+Ⅳ
[单选题]For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through ().
正确答案 :D
the crankcase door
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