绪论 单元测试

1、 问题:课程的目的是将理论与实践有机的结合起来,由简单到复杂、从基础到综合、从设计到创新,循序渐进,使同学们掌握电工与电子技术相关的基本实验与实践技能。( )
选项:
A:对
B:错
答案: 【

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第一章 单元测试

1、 问题:As a high-speed spaceship flies past you, it fires a strobe light that sends out a pulse of light in all directions. An observer aboard the spaceship measures a spherical wave front that spreads away from the spaceship with the same speed in all directions. What is the shape of the wave front that you measure? ( )
选项:
A:spherical
B:ellipsoidal, with the longest axis of the ellipsoid along the direction of the spaceship’s motion;
C:ellipsoidal, with the shortest axis of the ellipsoid along the direction of the spaceship’s motion
D:not enough information is given to decide.
答案: 【
spherical
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第一章 单元测试

1、 问题: Which of the following statements is not true( )。
选项:
A:Conventional fixed appliances move the tooth by bouncing back the arch wire.
B:In clear aligner technology, the appliances move the tooth by pressing the attachment and tooth surface.
C:Clear aligners move the tooth in the form of pulling.
D:Clear aligner technology and conventional fixed appliance technology have a consistency of treatment principles and basic principles.
答案: 【
Clear aligners move the tooth in the form of pulling.
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第一章 单元测试

1、 问题:从幼儿活动的形式来分,幼儿园环境应当包括:( )
选项:
A:语言环境
B:运动环境
C:劳动环境
D:游戏环境
答案: 【
语言环境
运动环境
劳动环境
游戏环境
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