When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.
1、A chain bridle is used when towing ast
A chain bridle is used when towing astern because it（）.AIs easy to connectBProvides an effective catenary and absorbs shock due to its weightCMakes rigging a swivel unnecessaryDPrevents the tow from yawing by the drag of the chains in a seaway
2、When used in conjunction with a turboc
When used in conjunction with a turbocharger, the main function of an after-cooler is to （）Aincrease the density of the cylinder air chargeBp...
3、When a magnetic compass is not in use
When a magnetic compass is not in use for a prolonged period of time it should（）.Abe shielded from direct sunlightBbe locked into a constant headingChave any air bubbles replaced with nitrogenDhave the compensating magnets removed
4、When using carbon dioxide to fight a f
When using carbon dioxide to fight a fire on a bulkhead，the CO2 should be applied（）.Afirst to the bottom of the flaming area，sweeping from...
When using a form-based authentication， which action must be used in the login form？...
6、When using a Lambert conformal chart i
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.Athe meridian through the obje...