单项选择题

Which of the following statistics and procedures can be used to determine whether a linear model should be employed?

A．The standard error of estimate.
B．The coefficient of determination.
C．The t-test of the slope.
D．All of the above are correct answers.

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不定项选择

冠形：是鸡品种的重要特征，主要有4种，包括玫瑰冠、单冠、豆冠、草莓冠等。

A．正确
B．错误

单项选择题

颅内肿瘤最好发的部位是 A.
大脑半球 B.
鞍区 C.
小脑 D.
脑干 E.
小脑脑桥角