不定项选择

集成三端稳压芯片7815的输出电压为15V。

A．正确
B．错误

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单项选择题

Throughout history, more than a few famous people were vegetarians. For example, Pythagoras, the famous Greek mathematician who lived in the fifth century B. C., kept to a wimple diet of bread, honey, and vegetables. Plato and Aristotle were also vegetarians, The poet Percy Bysshe Shelley became a convert to vegetarianism at twenty-one and later wrote a pamphlet in its defense. And Count Tolstoi, the Russian author famous for War and Peace, not only ate no animals; he would eat no eggs.
A、Most authors have been vegetarians.
B、Some vegetarians eat eggs.
C、Most vegetarians are men.

单项选择题

下列对唾液腺描述正确的是：

A．下颌下腺位于舌下襞
B．舌下腺位于下颌体与二腹肌之间
C．舌下腺小管开口于舌下襞
D．舌下腺管均开口于舌下阜
E．下颌下腺管开口于舌下阜