[单项选择]Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）
A. In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater
B. Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports
C. No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine
D. The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine

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[单项选择]Which of the following statements is TRUE regarding lashing requirements to secure vehicles aboard Ro-Ro vessels?（）
A. The securing of cargo on flats and trailers must be adequate to withstand road motions only
B. The movements experienced by road borne cargo are the same as the movements of a ship at sea
C. The generally recommended lash angle is no greater than 45 degrees relative to the deck in any direction
D. It is not necessary for an adequate number of securing points on the vehicles themselves since setting the brakes is sufficient

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[多项选择]Which of the following statements are true regarding bridges and switches (Choose 3.)（）。
A. Switches are primarily software based while bridges are hardware based.
B. Both bridges and switches forward Layer 2 broadcasts.
C. Bridges are frequently faster than switches.
D. Switches have a higher number of ports than most bridges.
E. Bridges define broadcast domains while switches define collision domains.
F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.

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[单项选择]Which of the following statements is true concerning the overall efficiency of air compressors?（）
A. High pressure compressors are more efficient than low pressure compressors
B. Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit
C. Two stage compressors are generally more efficient than single stage compressors
D. The volumetric efficiency is decreased in multistage compressors

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[单项选择]Which of the following statements is/are true regarding hydraulic pumps in general? （）
A. Variable volumes can be obtained with gear pumps only by variation of the pump drive speed
B. A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft
C. The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate
D. All of the above

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