A.They are self-priming
B.Decreasing the speed of rotation will decrease the discharge pressure
C.Opening the discharge valve wider will increase the discharge pressure
D.All of the above
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最新試題
When discharging an oil cargo，the first consideration is to（）.
The net productivity per gang-hour can be improved through a decrease of（）.
If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor（）.
The Master or person in charge of a ship shall ensure the crane record book shows the（）.
Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.
What is/are the advantage（s）of cranes over conventional cargo booms（）.
On no account（）to be exceeded.
When discharging oil from an oil tanker the instantaneous rate（）60 liters per nautical mile.
Which statement is FALSE concerning a tagline as used with a 30-ton pedestal crane（）.
When using slings，cargo handlers should take all the following precautions except（）.