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【多选题】
下列哪些情况可能产生多普勒效应 ( )A.
声源以超过声速的相对速度靠近观察者
B.
声源与观察者相对静止
C.
声源以一定的相对速度远离观察者
D.
声源以一定的相对速度靠近观察者
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举一反三
【简答题】Please fill in the blanks with the 14 expressions given below. spin out of control, consulting with, hinder, manipulated, echoes, retain, appetite, permissive, tackling, well-being, recession, suspen...
【简答题】脾脏肿大分三度：深吸气时脾缘在肋下 为轻度肿大， 为中度肿大， 为高度肿大。
【简答题】Our government urges _____________ efforts to fight the epidemic. 政府呼吁大家 齐心协力 抗击疫情。
【单选题】If you are a farmer in France exporting wheat, one day the government urges you to raise your exporting price, by compensating you a big sum of money for your loss of exporting quantity. This belongs ...
A.
tariff
B.
subsidy
C.
quota
D.
anti-dumping
【简答题】翻译括号里的词语: In order to protect (domestic markets) or (national industries), a government will set (barriers to trade). Trade barriers include (tariffs), (quotas), (foreign exchange controls), (import l...
【简答题】Part I — (Paras. 1- __) We are confused and ____________ by two contradictory messages that we get from our environment. The government tells us to ______________________________ __________________. A...
【简答题】看视频,填空: Nowdays, we feel (1)___________by the two contradictory messages we receive every day---spend or save. The government tells us to buy more to help the country go out of the ____________ and ba...
【简答题】有人认为“所有语句都表达命题”,这是不对的。因为凡命题都是有所肯定或有所否定,而有的语句,如纯疑问句则既无所肯定有无所否定。可见,有的语句不表达命题。
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