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问题
单项选择题
纤维饱和点是木材性质的转折点，含水率为（）。
A、10%
B、20%
C、30%
D、40%
答案
参考答案：C
选择题
She pretended ______ to the manager, but actually she was thinking about something else.
A. to listening
B. to have listened
C. to be listening
D. having listened
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名词解释
独占许可协议
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