【名词&注释】
往复泵(reciprocating pump)、活塞杆(piston rod)、惰性气体(inert gas)、理论上(theory)
                            
                                                                                         
                                                                    
                                                                     [单选题]检验前必须对舱内进行(),以满足人员进舱要求。
                                                                                                
                                  A. 清洗 
  B. 冲入惰性气体 
  C. 通风除气 
 
                                    
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                                     [单选题]________ there much cargo in the warehouse?
                                                                                                            
                                            A. Are 
  B. Is 
  C. Be 
  D. Will be 
 
                                                                    
                                    
                                     [单选题]Fusible plugs are installed in fire-tube boilers to _____.
                                                                                                            
                                            A. provide a means of draining the boiler 
  B. warn the engineer of low water level 
  C. cool the crown sheet at high firing rates 
  D. open the burners electrical firing circuits 
 
                                                                    
                                    
                                     [单选题]双缸四作用往复泵漏装一个泵阀,如不计活塞杆体积,理论上(theory)流量将( )。
                                                                                                            
                                            A. 减少1/2 
  B. 减少1/4 
  C. 减少1/8 
  D. 为0 
 
                                                                    
                                    
                                     [单选题]以下说法中正确的是________①当任意一船在前方发现他船前后桅灯成一直线,“对遇局面”规则开始适用②当任意一船在前方发现他船两盏红、绿舷灯时,“对遇局面”规则开始适用。
                                                                                                            
                                            A. ①对 
  B. ②对 
  C. ①②都对 
  D. ①②都不对 
 
                                                            
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