An obstruction on a helideck is any object that might present a hazard to the（）.

A . apparent wind speed only B . true wind speed and true wind direction C . true wind speed only D . apparent wind speed and true wind directio

A . a floodlight B . two red lights in a vertical line C . a single red light D . any visible light

A . Decreasing loran readings on 9960-W B . Visual bearings of Montauk Point Lt. changing to the left C . Increasing bearings of Southeast Point Light D . Decreasing sounding

A . prevent the generation of flammable or combustible gas in tanks B . blow out cargo lines to prevent the build up of gas concentrations C . dilute tank atmospheres to keep gas concentrations below the lower explosive limit D . prevent fires in the pumproom by continually displacing flammable vapor

A . rotor blades and landing gear B . unloading of passengers C . loading of cargo D . pilot's visibility

A . 1024 B . 2046 C . 4094 D . 4096 E . 8190

A . a 30 second on 30 second off alternating signal B . the continuous blast of the ships whistle for not less than 10 seconds supplemented by the continuous ringing of the general alarm bells for not less than 10 seconds C . an intermittent ringing of the general alarm for not less than ten seconds D . announced over the PA system

A . a marine chemist B . the Officer in Charge，Marine Inspection C . the Master or person in charge of the ship D . the National Fire Protection Associatio

A . 4 B . 8 C . 16 D . 32

A . only when the load is taken off the cable B . only when there is a load on the cable C . only when activated by the controls at the lowering station D . at any time

A . located in an air-conditioned area B . mounted in the passenger compartment C . protected by a collision bulkhead D . permanently mounted

A . spring loaded line thrower B . hand thrown buoyant line C . shoulder-type line throwing gun D . heaving line

A . spring-loaded line thrower B . hand thrown buoyant line C . shoulder type line throwing gun D . heaving line

A . lifeline B . painter C . drogue D . marker

A . hydraulic system B . pneumatic system C . spare battery D . hand crank

A . radar transponder beacon B . radar conspicuous beacon C . radar calibration beacon D . circular radiobeaco

A . Bouncing a straight stream of water off the overhead to create spray effect B . Spraying foam on a bulkhead and letting it flow down and over a pool of burning oil C . Flooding a paint locker with CO and sealing the compartment D . Cooling adjacent bulkheads with water to prevent the spread of the fire by conductio

A . blue line B . purple line C . dashed blue line D . alternate red and blue line

A . over-speeding of the engine B . failure of the engine to shut down C . no effect of engine mounting bolts D . high exhaust temperature

A . radar conspicuous beacon B . circular radiobeacon C . radar transponder beacon D . radar calibration beaco

A continuous watertight bulkhead on a ship may also be a/an (). A.structural bulkhead B.exterior bulkhead C.centerline bulkhead D.joiner bulkhead