The test ______, we began our holiday. A. was finished B. finishing C. was finis

The test ______, we began our holiday. A. was finished B. finishing C. was finis

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光源的时间相干性越好,其光谱宽度就越宽。()

光源的时间相干性越好,其光谱宽度就越宽。()

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绞合型光缆中所用的光纤有紧包光纤,没有松包光纤。()

绞合型光缆中所用的光纤有紧包光纤,没有松包光纤。()

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The Chief Officer estimated the broken space ______ 3 500 cubic feet.A.atB.byC.withD.in

The Chief Officer estimated the broken space ______ 3 500 cubic feet.A.atB.byC.withD.in

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