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An occluded front is caused by a(n) ______.
A.low pressure area
B.high pressure area
C.area of calm air
D.cold front overtaking a warm front
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highC
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low pressure areaB
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They are designed to provide for the flow of small volumes of tank atmospheres caused by thermal variations in a cargo tankB
They should operate in advance of the pressure/vacuum breakersC
They should be kept in good working order by regular inspection and cleaningD
All of the above
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