In （） pump a closed discharge valve will not cause excessive pressure to build up. ["gear","vane","screw","centrifugal"]
客户办理防伪换卡申请后可以取消申请。
A ship crane which has been idle for a period of over six months shall be inspected to the same standards as a（）. ["yearly inspection","quarterly inspection","monthly inspection","weekly inspectio"]
国际借记卡书面挂失及卡片失磁换卡必须更换卡号。
A seaman lost his continuous discharge book during the voyage. Upon discharge from Articles，he should be issued a（）. ["letter of service on company letterhead signed and sealed by the master","Record of Entry in a Continuous Discharge Book for use in applying for a duplicate book","Certificate of Discharge with the white copy forwarded to the Commandant","Mutual Release (CG-2119)，and the articles should be annotated as to the lo"]
怎样确定合理间隙值？
