the towboat vibrates when backing down
the roostertail exceeds the height of the main deck
a strain is placed on the face wires
water comes over the foredeck of the lead barges
第1题：
A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. The outer two strings of barges are the ______.
A.port and starboard strings
B.outer strings
C.drag strings
D.side strings
第2题：
When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind，the approach is best made ______．
A.With bow out，stern in
B.With bow in，stern out
C.Parallel to the dock，as close in as possible
D.Parallel to the dock，as far out as possible
第3题：
The circular steel structure installed around the propeller of a towboat is the______．
A.nozzle
B.shroud
C.strut
D.Hood
第4题：
前进一!（）
第5题：
A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of ______．
A.A vessel towing by pushing ahead
B.A power-driven vessel，not towing
C.A barge being pushed ahead
D.Either answer A or answer B
第6题：
You are pushing a tow ahead，at high speed，near the right hand bank of a canal．The forces affecting your towboat and tow will tend to ______．
A.Push both the head of the tow and the stern of the towboat away from the right hand bank
B.Push the head of the tow away from，and pull the stern of the towboat into，the right hand bank
C.Pull both the head of the tow and the stern of the towboat into the right hand bank
D.Pull the head of the tow into，and push the stern of the towboat away from，the right hand bank
第7题：
When one upbound vessel is overtaking another vessel and both are pushing a tow ahead，what reaction may you expect ________．
A.Both towheads will tend to drift apart，and the overtaking vessel will be slowed down
B.Both towheads will tend to drift together，and the overtaking vessel will be slowed down
C.Both towheads will tend to drift apart，and the overtaken vessel will be slowed down
D.Both towheads will tend to drift together，and the overtaken vessel will be slowed down
第8题：
---Slow ahead! ---Slow ahead! _______________!
A.Engine ahead slow!
B.Engine slow ahead!
C.Ahead engine slow!
D.Yes, sir
第9题：
---Slow ahead! ---Slow ahead! （）!
第10题：
Get（）（碰垫）ready！