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【单选题】
如图6甲所示,一块长木板放在水平桌面上现用一水平力F,缓慢地推木板,使其一部分露出桌面如图6示,在推木板的过程中木板对桌面的压力F、压强 和摩擦力 的变化情况是( )A.
F、 不变, 变大
B.
F、 不变, 变大
C.
F变小, 、 变大
D.
F、 不变, 变小
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举一反三
【单选题】Which of the following is Ralph Waldo Emerson’s first book?
A.
Nature.
B.
Representative Men.
C.
English Traits.
D.
The Conduct of Life.
【单选题】The president proposed that we should bring the meeting to a close,
A.
stated
B.
said
C.
suggested
D.
announced
【简答题】看跌期权多头行权时，按执行价格卖出标的资产。
【单选题】一种病理性呼吸节律,特征为间断性吸气或呼气,即在呼吸时,出现多次短促的吸气或呼气动作,这种呼吸属于
A.
陈施二氏呼吸
B.
毕欧特氏呼吸
C.
库斯茂尔氏呼吸
D.
间断性呼吸
【单选题】In the book"Nature",Emerson stated that（）
A.
man.s relationship with nature transcends the idea of usefulness
B.
nature is useful to man
C.
nature is independent of man and has nothing to do with man
D.
nature can only be used by man
【单选题】Which of the following is Emerson’s first book?
A.
Nature .
B.
Representative Men .
C.
English Traits .
D.
The Conduct of Life .
【简答题】bring the meeting to a close
【单选题】The president Proposed that we should bring the meeting to a close．
A.
stated
B.
said
C.
suggested
D.
announced
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