正确答案: A

中速柴油机的阀座与阀盘宜采用外接触线密封，而大型长行程低速柴油机采用内接触线密封

题目：为了延长排气阀的使用寿命，保证受热后气阀密封性，阀盘与阀座之间的接触是( )

解析：A

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举一反三的答案和解析：

[单选题]第三组：Following a security incident, in which the response measures outlined in the Ship Security Plan (SSP) have been activated, there will be a thorough review of their effectiveness and details will be made available, on request, to persons duly authorized by the Ship&39;s Flag State Administration. The Ship Security Plan is not subject to detailed inspection (other than confirming its existence on the ship) by duly authorized officials of a port State unless there are "clear grounds" to believe that the ship is not in compliance with the requirements of SOLAS or the ISPS Code, and the only means to verify or rectify the non-compliance is to review the relevant sections of the Plan. In such cases, access to the Restricted parts of the Plan relating to the non-compliance is exceptionally allowed, but only with the consent of the Flag State, or the master. If the master, in his professional judgment, believes that such "clear grounds" exist, and allowing access to relevant sections of the Restricted part of the Plan might resolve the situation, such access can be exceptionally granted. However, this should be immediately reported by the ship to the Company Security Officer (CSO). If access to the Restricted part of the Plan is denied by the master, this should be immediately reported by the ship to the Company Security Officer for guidance and reference to the Flag State.The Confidential part of a SSP cannot be subject to non-flag State inspection unless otherwise agreed by the contracting governments concerned. Any such request or demand by port state officials to view sections of the Confidential part of the Plan will be immediately reported by the ship to the Company Security Officer for guidance and reference to the flag State before any details are revealed to non-flag State officials. The Confidential provisions, which from an integral part of this Plan, are held by the Ship Security Officer (SSO)

persons duly authorized by the Ship&39;s Flag State Administration

[单选题]If our captain is not in his cabin, he must be on the（驾驶台）_______.

bridge

[单选题]锁骨骨折，应()

三角巾悬吊前臂于胸前或患肢固定于胸臂

[单选题]活塞环槽过度磨损后，可采用_______恢复其形状

车削

[单选题]When placed in a magnetic field, which of the materials listed will maintain the highest permeability?( )

Soft iron

解析：解析：magnetlc：磁的;permeability：渗透;Bakelite：电木;aluminum：铝

[单选题]影响运动副零件表面产生疲劳磨损的因素主要有( )。Ⅰ.零件材料疲劳强度;Ⅱ.接触表面的面积;Ⅲ.接触表面长期承受交变应力;Ⅳ.表面粗糙度;Ⅴ.表面硬度。

Ⅰ+Ⅲ+Ⅳ

[单选题]高血压病后期逐渐影响______等器官。

以上都是

[单选题]非本船人员进人机舱，须经＿准许。

轮机长