单选题But the fragile ecosystem could be hurt by a plan to dredge more than 23 miles of river at the delta’s southern end.A flimsy B optical C marginal D vacant

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单选题

But the fragile ecosystem could be hurt by a plan to dredge more than 23 miles of river at the delta’s southern end.

flimsy

optical

marginal

vacant

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第1题

Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?()A. optical technology for transmitting up to 32 channels over multiple fiber strandsB. optical technology for transmitting up to 16 channels over multiple fiber strandsC. a WDM system that is compatible with EDFA technologyD. a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .

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第2题

Except as provided for otherwise，an oil tanker might discharge certain amount at certain rate of oil or oily mixtures into sea when ______.A.the tanker is within 50 nautical miles from the nearest landB.the tanker is no more than 50 nautical miles from the nearest landC.the tanker is more than 50 nautical miles from the nearest landD.the tanker is not more than 50 nautical miles from the nearest land

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第3题

A SOLAS passenger ship safety certificate is required on all ______.A.T-Boats carrying more than 49 passengers for hireB.T-Boats that carry more than 12 passengers on an international voyageC.T-Boats carrying more than 150 passengers for hireD.large excursion vessels on lakes，bays，sounds，and river routes

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第4题

What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．A.Exposure to carbon dioxide for no more than 1 minuteB.Exposure to carbon dioxide for more than 10 minutesC.Exposure to a very low concentration of sulfur dioxide for no more than 2 minutesD.None of the above

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第5题

What two descriptions best define DWDM？（）A、 a WDM system that is compatible with EDFA technologyB、 an optical technology for transmitting up to 16 channels over multiple fiber strandsC、 an optical technology for transmitting up to 32 channels over multiple fiber strandsD、 a technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDME、 a technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM

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第6题

多选题If 4 more than twice n is a negative number and 6 more than n is a positive number, which of the following numbers could be the value of n? (Select all such numbers.)A-5B4C-3

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第7题

单选题Since 1960, the fast-growing town of Hotstone, Arizona, has drawn water from the Gray River, which feeds Lake Mudfish. If the town’s water use continues to grow at its present rate, in about 20 years the water level of Lake Mudfish will inevitably decrease to the point that it can no longer support its biologically fragile population of fish.　 The prediction above is based on which of the following assumptions?A As the town’s water requirements grow, it will not be able to meet those requirements by drawing on water sources other than the Gray River.B Since 1960, the lake’s population of fish has become more biologically fragile.C The amount of water that the lake loses to evaporation each year will increase over the next two decades.D There are multiple sources of water besides the Gray River that feed into Lake Mudfish.E The town of Hotstone will be able to reverse its trend of increasing water use if it implements an aggressive water conservation program.

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单选题But the fragile ecosystem could be hurt by a plan to dredge more than 23 miles of river at the delta’s southern end.A flimsy B optical C marginal D vacant

题目

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