单项选择题

在输入电压单调变化的过程中，单门限比较器和滞回比较器的输出电压均只跃变一次。
A、正确
B、错误

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单项选择题

Which of the following statements is correct? ()

A．Common shares have priority over preferred shares.
B．All issued shares are eligible to vote for the board of directors.
C．The number of shared issued > number outstanding > number authorized.
D．A share with cumulative dividends must be a preferred share.

多项选择题

骨盆骨折经治疗后的第二周应作哪些锻炼：( ) A.
下肢肌肉 B.
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膝关节屈伸 D.
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