当物体结构形状复杂，虚线就愈多，为此，对物体上不可见的内部结构形状采用（）来表示。
A、旋转视图
B、局部视图
C、全剖视图
D、端面图
参考答案：C
句子转换。
1. She is an American, and he is English. (变成复数句子)
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2. Are the twins in different classes? (变成陈述句)
3. They can see the blackboard and the door in the picture. (对划线部提问)
4. Lucy and Lily are new students. (变成一般疑问句)
5. —What are these?
—They are apples. (变成单数句子)
6. My teacher is over there. (就划线部分提问)
固定资产通常呈线性增长模式。（）
