正确答案: C
            iron or steel 
            题目:A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of
             解析:C
 
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            举一反三的答案和解析:
                                                    
                                 
                
                 [单选题]船上常用的液压拉伸器主要由( )组成。
                                                
                  
                                                                         一个千斤顶和一个间隔环 
                                                                                                                                                                                
                
                
                            
                
                 [单选题]直航船“独自采取操纵行动,以避免碰撞”的时机为________。
                                                
                  
                                                                                                                                                                                                             当发现让路船显然未遵照规则规定采取让路行动时 
                                            
                
                
                            
                
                 [单选题]The officer in charge of the engineering watch shall notify the chief engineer without delay ____.
                                                
                  
                                                                         in any emergency or if in any doubt as to what decision or measures to take 
                                                                                                                                                                                
                
                
                            
                
                 [单选题]公司应当在《符合证明》或《安全管理证书》有效期届满前申请____。
                                                
                  
                                                                                                                                                                                                             换证审核 
                                            
                
                
                            
                
                 [单选题]When it is necessary to remove a victim from a life threatening situation,the person giving first aid must ().
                                                
                  
                                                                                                                     Avoid subjecting the victim to any unnecessary disturbance 
                                                                                                                                    
                
                
                            
                
                 [单选题]在传播中,传导能力最差的是()
                                                
                  
                                                                                                                                                                 空气 
                                            
                
                
                            
                
                 [单选题]根据规则18条,从事捕鱼的船舶应给下列哪些船舶让路?________①帆船;②失控船;③操限船;④限于吃水的船舶;⑤从事一般拖带的船舶。
                                                
                  
                                                                                                                                                                 ②③ 
                                                                                        
                
                
                            
                
                 [单选题]柴油机是热机的一种,它是()
                                                
                  
                                                                                                                                                                 在气缸内进行二次能量转换的往复式压缩发火的内燃机