A、Stopping the boom
B、Topping or lowering the boom
C、Moving the boom left or right
D、All of the above
更多“What is meant by the term“luffing the boom”of a crane（）．”相关的问题
A、Lowering the boom B、Raising the boom C、Spotting the boom over the deck D、Swinging the boom athwartships
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 blocks
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、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 chain
A、Slow down the spread of fire by cooling adjacent structures B、Cover the fire with foam C、Smother the fire with a blanket or similar object D、Break up solid objects to ensure that any deep seated fires are extinguished
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、Transit traffic is handled by the RE only B、Transit traffic is handled by the PFE only C、Transit traffic is handled by both the RE and the PFE D、Transit traffic is not handled by the RE or the PFE
A、The index is not used by the optimizer but is maintained during DML operations. B、The index is not used by the optimizer and is not maintained during DML operations. C、The index is used by the optimizer only if a hint is specified in the query statement and is maintained during DML operations. D、The index is used by the optimizer only if a hint is specified in the query statement but is not maintained during DML operations.
A、Stations not directly involved with the on-going distress communications may not transmit on the distress frequency or channel B、Stations remaining off the air to safeguard proprietary information C、Two three-minute silent periods，at 15 and 45 minutes after the hour，that provide a transmitting "window" for distressed vessels to transmit distress alerts using J3E D、Communications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic
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