It allows for rotation of the hook in the single mode
It is required to“twin-up”30-ton pedestal cranes
It is used to pick up light loads
It is used to rigidly connect two cranes
第1题：
On a crane, the boom indicator tells the operator what angle the boom angle is compared to the ______.
A.vertical position
B.horizontal position
C.boom stop angle
D.minimum radius angle
第2题：
What is used when securing heavy vehicles aboard Ro-Ro vessels ________．
A.Buckle or ratchet tensioner
B.Webbing
C.Manila rope
D.None of these
第3题：
A、What's the matter with you
B、What is it like
C、How was your day yesterday
第4题：
WHAT IS CAPACITY OF CRANE？的意思是：舱容是多少？
第5题：
What is meant by the term“luffing the boom”of a crane ________．
A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
第6题：
The purpose of inert gas systems aboard tank vessels is to ______.
A.allow sufficient oxygen in the tank to sustain life
B.prevent outside air from entering the tank
C.provide increase in cargo discharge pressure
D.comply with double hull pollution prevention regulations
第7题：
What may NOT be used when securing heavy vehicles aboard Ro-Ro vessels ________．
A.Chain lever
B.Turnbuckle
C.Webbing
D.Chain
第8题：
______ food you've cooked!
A. How a nice
B. What a nice
C. How nice
D. What nice
8．答案为D food足不可数名词，前面不能用不定冠词。本句为感叹句，what nice用以修饰food。
第9题：
第10题：
What is the purpose of an administrative distance？