context.save()和context.restore()主要作用是什么？

Context in SFL refers to . A: Context of language B: Context of culture C: Context of society D: Context of situation

According to Numan, context can be classified into . A: linguistic context and co-text. B: nonlinguistic context and extra-linguistic context. C: situational context and cultural context D: linguistic context and nonlinguistic context.

为实现一个圆形的放大镜效果（即仅将特定圆形范围内的图像进行放大，外部图像保持不变），设函数draw实现原图绘制，函数enlarge实现图像放大的效果。以下代码片段正确的是？ A: context.save();context.beginPath();context.arcTo(50，50，50，0， Math.PI*2);context.clip();enlarge();context.restore();draw(); B: draw();context.save();context.arc(50，50，50，Math.PI*2, 0);context.clip();enlarge();context.restore(); C: context.save();enlarge();context.clip();context.arc(50，50，50，0， Math.PI*2);context.restore(); D: context.save();context.arc(50，50，50，Math.PI*2, 0);context.clip();draw();enlarge();context.restore();

How to narrow the following topic “The Effects of Deforestation on Gorillas in Africa ” A: Geographical context B: Historical context C: Biological context D: Social context

3.in which context will Gordon Brown’s announcement come true? A: in the context of a much bigger national disarmament B: in the context of a much bigger international disarmament C: in the context of a much bigger local disarmament D: in the context of a much bigger regional disarmament

Context clues only include general context, definitions, synonyms and antonyms.

Context

The doctor did ____ he can ___ the boy. A: everything what; save B: everything that; save C: all; to save D: all; save

canvas中规定了2D context，不支持3D context (WebGL)。