多项选择题

在存储选区对话框中将选择范围与原先的Alpha通道结合有哪几种方法可以选择？ A.
无 B.
添加到通道 C.
从通道中减去 D.
与通道交叉

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单项选择题

_________ can include a general topic in the first part and a specific topic about a distinctive feature of the study in the second part, which are often connected by a colon.
A、Nominal titles
B、V-ing titles
C、Two-part titles
D、Full-sentence titles

单项选择题

若A的所有顺序主子式均不为0，则A的LU分解存在且唯一。
A、正确
B、错误