不定项选择

对称双线性函数在任一组基下的度量矩阵都是对称矩阵.

A．正确
B．错误

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多项选择题

Tom is the best student in his class means____.
A、He is the top student in his class.
B、He is at the top of his class.
C、He studies the hardest in his class.
D、He helps others a lot in his class.

单项选择题

为改善中美关系，1971年7月，美国总统特使（）秘密访华。

A.基辛格
B.卡特
C.马歇尔
D.克林顿