the fuel tank fill pipe should be left open to allow vapors to vent from the tank
the engine should be started immediately to prevent vapor lock in the fuel line
all hatches should be opened and all compartments should be ventilated
open the fuel line and drain a small amount of gasoline into the bilge to clear the line of sediment
第1题：
43 Which of the following networking methods allows us to show that the last 10% of one element cannot be completed until 62% of a previous element has been completed?
A. PERT
B. ADM
C. PDM
D. All of the above.
E. A and C only.
第2题：
(A) has been raining
(B) rained
(C) was raining
(D) has rained
正确答案：C
解答参考：由前面的arrived 看出是过去发生的事情，而表示到达某地时在下雨，是当时正在发生的事情，所以选择过去进行时。【译文】我到达伦敦的时候正在下雨。
第3题：
Which of the following networking methods allows us to show that the last % of one element cannot be completed until % of a previous element has been completed?
A.PERT
B.ADM
C.PDM
D.All of the above.
E.A and C only.
第4题：
The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .
A.when the boiler has been secured long enough for most solids to settle
B.when the boiler has been cooled to ambient temperature
C.only after raising the water level to within 0.5 inch of the high water cutout only
D.after bypassing the low pressure
第5题：
A. has been on
B. has on
C. was on
D. had been on
第6题：
(A)when
(B) once
(C) which
(D) since
正确答案：D
解答参考：D此题考察句型It has been…since that… 自从……以来有多久了【译文】从铁路建成以来有一个多世纪之久了。
第7题：
A.had been collected
B.has collected
C.has been collected
第8题：
161 Which of the following networking methods allows us to show that the last 10% of one element cannot be completed until 62% of a previous element has been completed?
A. PERT
B. ADM
C. PDM
D. All of the above.
E. A and C only
第9题：
The loss has not yet been accurately, but it is believed to be well beyond a hundred million dollars.
A. calculated B. considered C. completed D. controlled
第10题：
The rocket will weigh about 200 tons when _____.
A. being completed
B. completed
C. completing
D. have been completed