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What is matter wave? who proposed it?

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第1题

According to the passage,what is the difference between tidal waves and tides?

A.Tidal waves are caused by underwater earthquake,but tides are not.

B.Tidal waves have regular rise and fall,but tides have not.

C.Tidal waves can be prevented,but tides can not.

D.Tidal waves can hit the land,but tides can not.

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第2题

What is the important discovery about seismic waves mentioned by the instructor?

A.They occur at regular intervals.

B.They can withstand great heat.

C.They travel through the Earth"s interior.

D.They can record the Earth"s internal temperature.

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第3题

In midocean,the characteristics of a wave are determined by three factors.What is NOT one of these factors?

A.Effect of the moon’s gravity

B.Fetch

C.Wind velocity

D.Length of time a wind has been blowing

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第4题

What is the approximate range of VHF radio waves during the day time?

A.30 nautical miles

B.600 nautical miles

C.150 nautical miles

D.1200 nautical miles

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第5题

What is the approximate range of MF radio waves during the day time?

A.30 nautical miles

B.600 nautical miles

C.150 nautical miles

D.1200 nautical miles

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第6题

What is causing the sixth great extinction according to the polling?

A.Five extinction waves in the history.

B.The Permian and the Cretaceous event.

C.An errant asteroid and some volcanoes.

D.The human beings.

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第7题

What is the author's attitude toward Wave?

A.Optimistic.

B.Indifferent.

C.Pessimistic.

D.Critical.

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第8题

Herry waved to his sister, __ was just getting off a bus.

A.Who

B.That

C.Which

D.Whose

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