A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.
A . heavy-walled drill pipe
B . tool joint
C . down hole tool
D . drill collar
相似题目
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The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
A . remain constant along the tubes length
B . be greatest in a single pass counter flow heat exchanger
C . remain constant throughout the heat exchanger
D . vary from section to section through out the heat exchanger
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The man with（）strength could lift a heavy rock without any difficulty.
A . powerful
B . strong
C . intelligent
D . phenomenal
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Condensate formed within the first-effect tube nest of a double-effect,low pressure evaporator, is removed by a （）.
A . series of baffles
B . crossover pipe
C . condensate separator
D . drain pum
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A single heavy wire made up for the topping lift is called a（）.
A . Bale
B . Spanner wire
C . Bull line
D . Working guy
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When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and （） the sea water passing through the tubes.
A . dispose
B . dissolve
C . heat
D . dissipate
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Waterside scale in a fire-tube boiler may cause （）.
A . increased heat transfer
B . fireside erosion
C . high steam demand
D . overheated tube
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An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the （）.
A . propeller hub
B . lignum vitae
C . shaft packing
D . labyrinth seal
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When lowering lifeboats in heavy seas，a good practice is to rig frapping lines（）.
A . on only the forward falls
B . on only the after falls
C . with a lead of about 45 degrees to the boat
D . from the falls to the main deck of the vessel
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What is NOT a function of the steam drum of a marine water-tube boiler（）.
A . Receives saturated steam from the generating tubes
B . Serves as a reservoir of boiler feed water
C . Holds internal fittings for separation of moisture from steam
D . Collects steam exhausted from the turbine
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Lubricating oil should be changed on a heavy duty diesel engine when（）.
A . it gets dark in color
B . a sample rubbed between fingers feels thin
C . it has been in use for a specified interval
D . it no longer supports combustio
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When preparing a ship for heavy weather，fuel oil day tanks should be（）.
A . pumped overboard to calm the seas
B . drained to the lower hull to reduce free surfaces
C . filled to ensure that sufficient fuel oil is available during a lengthy emergency
D . partially drained to increase free surfaces in order to reduce motio
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What is NOT used as a stern tube bearing，on a large vessel? （）
A . Wooden (lignum vitae) strips
B . Hard rubber
C . Resin bonded composition
D . Bronze bushing
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A distorted furnace in a fire-tube auxiliary boiler may be the result of （）
A . firing for extended periods in the low fire mode
B . overheating, due to waterside deposits
C . varying the water level above the crown sheet
D . carrying excessive alkalinity in the boiler water
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When a rescue vessel approaches a lifeboat in heavy seas，the person in charge of the lifeboat should（）.
A . tie up to the rescue vessel
B . transfer only those personnel who are not seasick
C . wait for calmer weather before transferring personnel
D . transfer all personnel immediately
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On his back the man carried a heavy（）of old clothes.
A . bulk
B . bundle
C . stock
D . ma
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In the event of a flame failure in an auxiliary water-tube boiler, you must（）
A . relight the boiler immediately to prevent loss of steam pressure
B . relight the fire off the brickwork as the bricks are cherry red
C . purge the furnace of any combustible gases before attempting to relight the fire
D . speed up the feed pump to prevent dry firing when the burner flame is reestablished
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The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
A . operating the boiler at less than normal water level
B . installing fins on the firesides of water-tubes
C . increasing the amount of excess air to the burners
D . treating the boiler water with chemical oxygen scavenger
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The sensors could be mounted on the inside of a tube/torus that could be anchored in a blood vessel, making the blood flow through the sensor array.
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If there were a heavy snow next Sunday,we ____ not go skating.
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In the sentence The sensors could be mounted on the inside of a tube/torus that could be anchored in a bloodvessel, the underlined word mounted means .
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Heavy rains that fell in early June have eased a prolonged drought.
A．expanded
B．frustrated
C．lubricated
D．relieved
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患重感冒用have a bad cold, 不用have a heavy cold（）
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Michael, a 42 y.o. man is admitted to the med-surg floor with a diagnosis of acute pancreatitis. His BP is 136/76, pulse 96, Resps 22 and temp 101. His past history includes hyperlipidemia and alcohol abuse. The doctor prescribes an NG tube. Before inserting the tube, you explain the purpose to patient. Which of the following is a most accurate explanation？
A．“It empties the stomach of fluids and gas．”
B．“It prevents spasms at the sphincter of Oddi．”
C．“It prevents air from forming in the small intestine and large intestin
E．”
D．“It removes bile from the gallbladder．”
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The doctor _a tube in the patient’s nose for oxygen（）
A．inserted
B．reversed
C．guaranteed
D．survived
