[单项选择]Which of the following is/are TRUE regarding lashing requirements to secure vehicles aboard Ro-Ro vessels? （）
A. The securing of cargo on flats and trailers and in containers must be adequate to withstand both road and sea motions
B. The generally recommended lash angle cannot be greater than 45 degrees relative to the deck inany direction
C. It is necessary for an adequate number of securing points on the vehicles themselves in order that lashings may be properly and safely utilized
D. All the above

[单项选择]Which of the following is true regarding the use of switches and hubs for network connectivity（）。
A. Switches take less time to process frames than hubs take.
B. Switches do not forward broadcasts.
C. Hubs can filter frames.
D. Using hubs can increase the amount of bandwidth available to hosts.
E. Switches increase the number of collision domains in the network.

[单项选择]Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）
A. an increase in the exhaust temperature of the affected cylinder
B. the turbocharger may surge
C. the explosion pressure in all cylinders will rise violently
D. smoke from the turbocharger air inlet filter will be seen

[单项选择]Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?（）
A. the direct acting relief valve is used for controlling lower flows and pressure
B. the pilot operated relief valve is used for controlling higher flows and pressure
C. the pilot operated relief valve is used for controlling lower flows and pressure
D. the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve

[单项选择]Which of the following statements regarding the use of multiple access lists are valid when configuring a single interface on a Cisco router?（）
A. Application of up to three access lists per protocol to a single interface.
B. No more than two access lists per interface.
C. One access list may be configured per direction for each Layer 3 protocol configured on an interface.
D. The maximum number allowed varies due to RAM availability in the router.
E. An infinite number of access lists that can be applied to an interface, from most specific to most general.
F. Cisco IOS allows only one access list to an interface.

[单项选择]Which of the following statements regarding low expansion foam and its application is INCORRECT?（）.
A. Foam should not be used on electrical fires
B. One kilo of low expansion foam solution produces much more foam
C. Foam is only efficient when it covers the top of burning combustibles
D. A stream of foam should be deflected off the deck in order to best agitate the fire

[单项选择]Which of the following statements is TRUE regarding automatic identification systems (AIS)? （）
A. AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position，course，speed and other safety related information to all those with similar equipment in the area
B. AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position，course，speed and other safety related information to all those with similar equipment in the area
C. AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position，course，speed and other safety related information to all those with similar equipment in the area
D. AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position，course，speed and other safety related information to all those with similar equipment within the area

[单项选择]Which of the following statements is true concerning simple parallel resistance circuits?（）
A. The total current flow equals the sum of the individual currents
B. The total current flow equals the reciprocal of the sum of the individual currents
C. The total resistance equals the sum of the individual resistance
D. The total voltage equals the sum of the individual voltages across each resistance

[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

[单项选择]Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）
A. The mixture is too lean to burn
B. The mixture is too rich to burn
C. The vapor is about to explode
D. Conditions are perfect for combustion