The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.
A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure
第1题:
A) formation
B) explosion
C) eruption
D) propulsion
第2题:
I should like to rent a house,modern,comfortable and __________in’a quiet environment.
A.before all
B.after all
C.first of all
D.above all
第3题:
第4题:
In Britain people _____________ four million tons of potatoes every year.
A) swallow B) dispose
C) consume D) exhaust
C看意思就知道了 在英国,人们每年消耗四万顿马铃薯。A吞咽B处理C消耗d耗尽(表示人精神耗尽)
第5题: