题目内容

56.在AfterEffects中,对于生成遮罩(Mask)的描述不正确的是:

A. 可以用钢笔工具(PenTool)绘制自由遮罩
B. 可以用矩形和椭圆遮罩工具绘制规则遮罩
C. 可以在准备建立遮罩的目标层上单击鼠标右键,选择Mask>NewMask命令,绘制各种遮罩
D. 可以利用在AdobePhotoshop或AdobeIllustrator中绘制的路径作为遮罩

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52.AfterEffects中,用下面的什么运算可以求一个图层上mask1和mask2之间的交集(假设mask1和mask2的不透明度为100%,且mask1在mask2的上面)?

A. mask1为Add方式,mask2为Subtract方式
B. mask1为Add方式,mask2为Intersect方式
C. mask1为Add方式,mask2为Difference方式
D. mask1为Add方式,mask2为Add方式

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MySQL默认的数据库引擎是（）。

A. FEDERATED
B. CSV
C. My ISAM
D. lnnoDB

MySQL中查看数据库引擎的命令是（）。

A. SHOW ENGINES
B. SHOW ENGINE
C. SHOW DATABASES
D. SHOW TABLES