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【单选题】
喇叭电路采用继电器目的是A.
延长喇叭按钮寿命
B.
调节喇叭音频
C.
增大喇叭音量
D.
提高喇叭寿命
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【简答题】听下面一段对话，回答1-3题 1. Why are the blood banks short of blood? A. Fewer people are giving blood. B. The number of operations is increasing. C. Many people have been hurt in accidents recently 2. Why is the...
【简答题】阅读理解。 The average has about five litres of blood living inside of their body, flowing through their vessels (血管), delivering essential elements, and removing harmful wastes. Without blood, the h...
【简答题】阅读理解。 Blood Donation (献血) A grown-up person has ten or eleven pints (品脱) of blood inside his or her body. We can lose a pint of blood without feeling, but if we lose too much blood, we feel weak and c...
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