单项选择题

胸骨柄、胸骨体相交接处，微向前突，称胸骨角。

A．对
B．错

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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

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.