单项选择题

After you enter the Ohio River at Cairo，the Map shows that the deepest water under the Illinois Central RR Bridge would be found under which span? （）

A.Right Descending Bank span
B.Left Descending Bank span
C.Center span
D.Water is equal under all spans

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单项选择题
After the passage of a cold front the visibility（）.

A.does not change
B.improves rapidly
C.improves only slightly
D.becomes poor
单项选择题
After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning?（）

A.Scrubber
B.Demister
C.Deck water seal
D.Final filter
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