更多"The main bearing shells are made of"的相关试题:
[单项选择]The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion.
A. flange
B. flash
C. plate
D. sheet
[单项选择]The bearing shells depend on the accuracy of （） to held them in a truly circular shape.
A. the gap
B. the clearance
C. the bore
D. the housing
[单项选择]A main bearing consists of two shells which are secured by means of studs and （）.
A. tie rods
B. through bolts
C. lead wires
D. bearing caps
[单项选择]The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.
A. shims
B. packing
C. glands
D. washers
[单项选择]Wood or steel hatch covers are made（）by tarpaulins.
A. watertight
B. resistant to water
C. so safe that no water will affect the hold
D. so strong that no water will come into the hold
[单项选择]The main purpose of changing main engine to electronic controlled is not to（）
A. control fuel injection time more precisely
B. control fuel injection rate more precisely
C. meet the environmental requirements
D. meet high engine speed requirements
[单项选择]The main purpose of warming the parts of the main engine is （）
A. to reduce heat stress
B. to reduce low temperature corrosion
C. to improve firing and starting performance
D. fuel saving
[单项选择]The circular steel structure installed around the propeller of a towboat is the（）.
A. nozzle
B. shroud
C. strut
D. hood
[单项选择]A heavy steel curved arch constructed athwartships and above the after deck on a towing vessel is sometimes called a（）.
A. main brace
B. tow span
C. jockey bar
D. None of the above
[单项选择]Stainless steel is material commonly used for temperatures up to 50℃; beyond that and for severe corrosive conditions other materials are requiredThe bold and italic word “that” probably means （）.
A. stainless steel
B. temperature
C. 50℃
D. other materials
[单项选择]The joint formed when two steel plates are placed end-to-end is called a（）.
A. bevel
B. seam
C. butt
D. bond
[单项选择]Experience shows that where signs of rust on steel shipments are apparent at the time of shipment，Mates-Receipts and Bills of Lading need not necessarily in all cases be（）with the single word “rusty”.
A. claused
B. worded
C. given
D. written
[单项选择]The stainless steel bars are painted by（）.
A. lot
B. lots
C. a lot
D. the lots
[单项选择]A small light tackle with blocks of steel or wood that is used for miscellaneous small jobs is called a（）.
A. snatch block
B. threefold purchase
C. handy-billy
D. chockablock
[单项选择]What is the purpose of cant frames in steel vessels? （）
A. To support the overhang of the stern
B. To provide strength to shell plating at the stern
C. To add strength to the deck beams which support the weather decks
D. To support the plating of a cylindrical tank
[单项选择]Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）
A. Both seamless mild steel and copper may be used for middle pressure steam
B. "hpair" means high pressure air
C. The feed piping of the boilers can be made of seamless mild steel
D. All oil pipings are made of mild steel
[单项选择]A vessel is constructed with a steel hull and an aluminum superstructure. Which statement is TRUE?（）
A. The aluminum will provide greater resistance to the spread of fire by conduction
B. The aluminum structure is usually attached to a steel coaming by a method that insulates the two metals
C. If the superstructure is stressed，an aluminum structure requires additional expansion joints to prevent fracture
D. The steel at the area of the aluminum-to-steel connection must be closely checked for galvanic corrosion
[单项选择]A heavy steel device that is set on the sea floor and used as a drilling template in offshore drilling operations is called a（）.
A. temporary guide base
B. permanent guide base
C. guide frame
D. foundation template
