Bilge keels are more effective at clam

1、At the moment our technology is more a

At the moment our technology is more advanced than theirs, but they are（）fast.Acatching upBcatching onCcatching atDcatching out

2、Bilge keels are more effective at damp

Bilge keels are more effective at dampening rolls as the（）.Apitching increasesBlist increasesCrolling increasesDdraft decrease

3、The function of the bilge keel is to（）

The function of the bilge keel is to（）.Areduce the rolling of the vesselBserve as the vessel's main strength memberCadd strength to the bilgeDprotect the vessel's hull when alongside a dock

4、Bilge keels are fitted on ships to（）.

Bilge keels are fitted on ships to（）.Aassist in drydock alignmentBimprove the vessel's stabilityCprotect the vessel from slamming against piersDreduce the rolling of the vessel

5、Vessels lying afloat at buoys for more

Vessels lying afloat at buoys for more than 24 hours should use anchor chain for（）and insurance wire for（）.Abow mooring／stern lineBforward spring／after springCforward breast rope／forward springDslip rope／stern line

6、（） are more suitable for large quantit

（） are more suitable for large quantities at low pressure.AReciprocating pumpsBRotary pumpsCCentrifugal pumpsDGear pum