The purpose of a custom is to cut down imports in order to protect domestic industry and workers from foreign competition.

A . prevent an internal explosion in the pump when it is overheated B . enable a visual inspection of the pump while it is running C . insure a proper alignment of the pump coupling to the driver D . accommodate for friction between the impeller and the easing

A . act as a chain stopper B . prevent the windlass from engaging C . prevent the chain from fouling on deck D . control the wildcat

A . appeal B . encourage C . arouse D . attract

A . produce the heat for ignition B . decrease injection lag C . increase ignition delay D . aid in exhausting burnt gase

A . afford access to the shell through the double bottoms B . collect water to be pumped out C . provide access for the pneumercator D . provide a base line for sounding measurement

A . counterbalance the crank throws on the crankshaft B . keep the engine running smoothly between power stroke C . provide a belt-driving surface for the operation of auxiliary machinery D . prevent the engine from overspeeding

A . acts as a meeting place for sources and receivers of multicast traffic B . used in PIM dense m ode to create a database of all multicast sources C . used in PIM dense and sparse mode to create a database of all multicast sources D . acts as the designated router for a broadcast segment when multicast routing is enabled

A . help preheat the air for the furnaces B . help preheat the feedwater C . protect economizer from excessive heat D . prevent excessive furnace heat losse

A . On/Off CoD B . Reserve CoD C . Permanent CUoD D . Capacity Backu

A . it is not used in multicast B . it determines the virtual address group for a multicast destination C . it dynamically registers individual hosts in a multicast group on a specific LAN D . it is used on WAN connections to determine the maximum bandwidth of a connection E . it determines whether Bidirectional PIM or PIM sparse mode will be used for a multicast flow

A . It allows for rotation of the hook in the single mode B . It is required to“twin-up”30-ton pedestal cranes C . It is used to pick up light loads D . It is used to rigidly connect two crane

A .  it is not used in multicast B .  it determines the virtual address group for a multicast destination C .  it dynamically registers individual hosts in a multicast group on a specific LAN D .  it is used on WAN connections to determine the maximum bandwidth of a connection E .  it determines whether Bidirectional PIM or PIM sparse mode will be used for a multicast flow

A . Provides surface for applying force on machinery B . Provides landing surface for the sounding bob C . Absorbs machinery vibration D . Prevents valve stem over-travel

A . present Cisco products B . provide a framework of tested and proven models C . identify basic needs of the business D . calculate the business need priority

A . change AC to DCcurrent B . change DC to AC current C . neutralize a armature reaction D . carry current to the outside circuit

A . eliminate hot air from the condenser B . maintain steady pressure in a system C . heat, or cool one fluid by means of another fluid D . reduce the engine room temperature in tropical climate

A . Aid in casting off B . Direct the drift of the vessel C . Aid in its recovery D . Maintain maximum resistance to broaching

A．show the direction in which the imaginary cut surface is viewed B．indicate the location of the cutting plane C．identify the reference letters such as section A-A or B-B,etC D．all of the above