ferries
passenger liners
cruise ships
ocean going vessels
第1题：
29． Which of the following is NOT true?
A． In 1884，George Eastman invented a kind of film．
B． Deep-sea divers take pictures of ocean plants and animals．
C， The films were developed by the owners of the cameras in the past
D． Astronauts use cameras to take f，photos in space
第2题：
（）（不定期船）run in all parts of the world.
第3题：
A、cargoes
B、cargo
C shipments
D、quantities
第4题：
polished
renewed
adjusted
ground
第5题：
How long the haul for international deep-sea movement usually? （）
第6题：
（）run in all parts of the world.
第7题：
Liners sail on regular routs and keep to a fixed timetable.（）
第8题：
The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.
A.steel
B.copper
C.cast iron
D.stainless steel
第9题：
lower thermal expansion rates than wet liners
greater heat transfer rate than wet liners
greater wear resistance than wet liners
procedure to replace dry liners is simpler than for wet liners
第10题：
The chromium will not wear out the piston rings
The chromium strengthens the liners in the way of the scavenging air ports
Chromium eliminates the need for oil scraper rings
Pores in the plating aid in maintaining the lube oil film