
【名词&注释】
直升机(helicopter)、持续时间(duration)、四冲程柴油机(four-stroke diesel engine)、一分钟(one minute)
                            
                                                                                         
                                                                    
                                                                     [单选题]The seven segment arrangement for numerical(数字的) display on consoles, test meters and other applications can be either______.
                                                                                                
                                  A. UJT or BJT 
  B. BCD or OCD 
  C. JFET or IGFET 
  D. LED or LCD 
 
                                    
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                                                                    举一反三:
                                                                    
                                                                         
                                    
                                     [单选题]The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the
                                                                                                            
                                            A. prime mover speed 
  B. exciter output voltage 
  C. load on the alternator 
  D. number of poles 
 
                                                                    
                                    
                                     [单选题]直升机进行吊升的悬空高度一般是距甲板(艇、筏):
                                                                                                            
                                            A. 15m 
  B. 18m 
  C. 27m 
 
                                                                    
                                    
                                     [单选题]The amount of fluid delivered by a positive displacement pump can be regulated by _____.
                                                                                                            
                                            A. throttling the pressure line 
  B. changing the speed of the driving rotor 
  C. either A or B 
  D. None of the above is tree 
 
                                                                    
                                    
                                     [单选题]互见中,一艘限于吃水的船舶与一艘操限船交叉相遇致有构成碰撞危险,则________。
                                                                                                            
                                            A. 两船均应采取避让行动 
  B. 有他船在本船右舷的船应给另一船让路 
  C. 操限船为让路船 
  D. 限于吃水的船舶为让路船 
 
                                                                    
                                    
                                     [单选题]一次失血超过血液总量多少时,生命活动即有困难()
                                                                                                            
                                            A. 20% 
  B. 26% 
  C. 28% 
 
                                                                    
                                    
                                     [单选题]下列警报信号中持续时间不足一分钟(one minute)的是?
                                                                                                            
                                            A. 堵漏 
  B. 弃船 
  C. 警报解除 
  D. 消防 
 
                                                                    
                                    
                                     [单选题]四冲程柴油机活塞的磨损主要发生在
                                                                                                            
                                            A. 裙部外圆表面 
  B. 头部外圆表面 
  C. 环槽 
  D. 裙部下端外圆表面 
 
                                                            
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