Listen to a short passage and choose the best answer to each question you hear.[音频][音频]
A. Queen Elizabeth I.
B. Sir John Harrington.
C. Thomas Crapper.
D. Queen Elizabeth I's godmother.
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[音频]
A. It was difficult to pull the knob on a chain to release water from the bowl.
B. It was very difficult to put water into the bowl.
C. The basin had to be emptied and cleaned constantly.
D. Removing the waste was highly waterconsuming.
[音频]
A. They improved the pipes that were attached to the bottom.
B. They added a knob on the chain to pull more easily.
C. They improved the flush system to make it less water-consuming.
D. They improved the collection bowl to make it more sanitary.
[音频]
A. The person who invented the toilet.
B. The significance of the toilet in our life.
C. The invention of the toilet.
D. The development of the toilet.
下列关于对流传热系数的说法,正确的有( )。
A. 同一种流体,有相变的高于无相变的
B. 气体高于液体
C. 同一流体,强制对流高于自然对流
D. 蓄热能力越大,传热速率越大,对流传热系数越大
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