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【判断题】
简谐波在通过弹性媒质时，的弹性势能与动能是同步变化的，机械能不守恒。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Compared to the last version, this product may have been an improvement, but its sales _______ is still a mystery.
A.
proper
B.
prospect
C.
person
D.
people
【判断题】Some luxury product manufacturers will purposefully raise prices on their goods in order to reduce sales volume. This strategy may subject to the bandwagon effect.
A.
正确
B.
错误
【简答题】This product may ( 包含)______ milk and eggs.
【简答题】This product may _____ milk and eggs. ( book, funny, luxury, price, path, contain, interview, mall, discount, parking, salad, hurry, diner, canceled, usual, cash , tired )
【单选题】The company has confidence in this product, we may say: "we think it will be very ( )."
A.
clean
B.
normal
C.
successful
D.
expensive
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