What is meant by the term“luffing the boom”of a crane（）．

A . Pounds of force necessary to damage a container B . Total weight of a container and contents C . Weight of a container D . Weight of the contents of a container

A . No literal value is substituted for a shared cursor.  B . Different execution plans are generated for substituted literal values.  C . The substitution of a literal value will produce different execution plans.  D . The substitution of any literal value will produce exactly the same execution plan.

A .  single layer of firewalling B .  multiple layers of firewalling C .  firewall connections in either an active or standby state D .  an architecture in which all traffic between firewalls goes through application-specific server

A .  packetization B .  quantization C .  decoding D .  sampling

A . apparent slip B . tree slip C . pitch D . propulsive efficiency

A . Having the vessel head toward the sea B . Running before a sea C . Being turned broadside to the sea D . Having the vessel filled with water

A . Lowering the boom B . Raising the boom C . Spotting the boom over the deck D . Swinging the boom athwartshi

A . multiple layers of firewalling B . a method of operating firewalls from multiple vendors C . firewall connections in either an active or standby state D . an architecture in which all traffic between firewalls goes through application-specific servers E . an architecture in which all traffic between firewalls goes through application-specific gateway

A . Bringing the anchor to short stay B . Heaving in all the chain C . Locking the windlass to prevent more chain from running out D . Paying out more chai

A . Lowering it into a cradle B . Placing it in a desired position C . Spotting it with wash primer and red lead D . Two-blocking it

A . The bottom block touches the top block B . The line has jumped the sheaves C . There are turns in the fall D . You have two block

A . ignition ratio B . power ratio C . compression ratio D . injection ratio

A．Calculability B．Cancellability C．Non - detachability D．Non - conventionality

A Payment authorization B Bid cost considerations C Release payment D Back charge E None of the above.

A Songs sung by zebra finches at a concert. B Songs sung by female finches for male finches C Songs sung by male finches to other finches. D Songs sung by male finches for female finches

A．the amount of time that the writer spends writing a report B．the reader's unwillingness to make an effort to understand a report C．the amount of time that the reader spends reading any report D．the writer's difficulty in presenting reports in an easily-understood style

A.Having the vessel head toward the sea B.Running before a sea C.Being turned broadside to the sea D.Having the vessel filled with water

A.Observing the activity B.Evaluating the activity C.Monitoring the activity. D.Controlling the activity

A．sensation B．sensory activation C．perception D．transduction