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【简答题】
One of the 63.5-cm-long strings of an ordinary guitar is tuned to produce the note (frequency 245 Hz) when vibrating in its fundamental mode. (a) Find the speed of transverse waves on this string. (b) If the tension in this string is increased by 1.0%, what will be the new fundamental frequency of the string?
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【单选题】The ship could stay afloat with as many as ___________ watertight compartments flooded?
A.
2
B.
4
C.
6
D.
8
【简答题】微博营销的分类有哪些?
【单选题】Identify the topic sentence of this paragraph Some books read in childhood are truly unforgettable. Some of the characters, the paces, the adventures experienced with so much excitement when one is qu...
A.
Some of the characters, the paces, the adventures experienced with so much excitement when one is quite young, stay in one’s mind as long as memory lasts.
B.
Some books read in childhood are truly unforgettable.
C.
Such a character is Long John Silver in Robert Louis Stevenson’s Treasure Island .
D.
Who would give up these perfect childhood memories?
【单选题】The passengers ______ when the ship was heavily rolling.
A.
slept well
B.
could drink a lot of water
C.
had to stay below deck
D.
had a big room of more than 5 foot high
【单选题】The passengers_______when the ship was heavily rolling. 查看材料
A.
slept well
B.
could drink a lot of water
C.
had to stay below deck
D.
had a big room of more than 5 foot high
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