题目内容
以下属于回转体的是（ ）
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绘制回转体表面上点的投影可以使用的方法有（）和（）
回转体的形成必须要有旋转中心轴。
回转体三视图必须把回转面上所有的素线都画出来。
U2-ReadingA - Task 4Choose the correct answers to complete the following sentences.(1 )1. If there is a new ______________on your phone, the relevant icon will be displayed.(2) 2. This book introduces the advantages of different kinds of ______________ systems.(3) 3. ______________menu items (菜单项) when they are not applicable (适用的).(4) 4. Any problem can be ______________by the new piece of equipment.(5) 5. Some of our software can quickly ______________ the virus (病毒).(6) 6. Prices range from $100 to $ 200, depending on the particular ____________.
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