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【简答题】
已曝光、未冲洗的电影胶片
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】Why do some publishers no longer promote their books?
A.
Because the paper books are not profitable enough to sustain promotion.
B.
Because Amazon's near monopoly over the industry makes promotion unnecessary.
C.
Because the public have easy access to the books' sales and reviews.
D.
Because all the writers are promoting the books on their own.
【简答题】按传播声道分：超声波流量计可分为（）和多声道，其中多声道又可分为双声道、四声道、八声道。
【简答题】声道分为:
【单选题】声音编码的模式分为(6)。
A.
单声道、立体声、左声道、右声道
B.
单声道、立体声、环绕声、右声道
C.
单声道、立体声、环绕声、联合立体声
D.
单声道、立体声、双声道、联合立体声
【单选题】Why are publishers making their books freely available?
A.
They want to make money.
B.
They do not like to lose their audience.
C.
They are competing for fun.
D.
They try to win more freedom.
【单选题】配制浓度为0.2mol/L盐酸溶液500ml应取浓度 为12mol/L的浓盐酸的体积为多少毫升？
A.
8.3 mL
B.
16.7 mL
C.
4.2 mL
D.
1 mL
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