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单选题
Each fire hydrant must have at least one spanner and at least one（）.
A
hose rack or reel
B
all purpose nozzle
C
foam applicator
D
pick axe
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单选题Which statement is true regarding the COALESCE function?（）A
It can have a maximum of five expressions in a list B
It returns the highest NOT NULL value in the list for all rows C
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It requires that at least one of the expressions in the list must have a NOT NULL value
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单选题If not attached to the nozzle,each low-velocity spray applicator on a vessel must be stowed（）.A
in a protected area on the main deckB
inside a machinery space near the entranceC
next to the fire hydrant to which the fire hose is attachedD
on a rack inside the quarters near the entrance
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