题目内容

致残的原因不包括:

A. 维生素D严重缺乏等营养不良
B. 类风湿性关节炎
C. 交通事故
D. 传染病
E. 失眠

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使用正确的物主代词，补全下面的对话。A: Is this _ pen, Linda?B: No, it isn’t. pen is in the bag.A: Sara is here. Is this pen?B: No. pen is red.A: Tom is also here. It is pen.

根据括号中代词的提示,使用正确的物主代词填空, 完成有关 “我的家庭”的作文。My familyI am a student( I )mother works in a school and is kind to(she) students. And( I )father is a manager. He is often busy and often stays with (he) friends. Both of them love(they) work. We all love(we)family.

原始资料的调查主要是对()进行调查?

A. 对建设单位与设计单位的调查
B. 自然条件调查分析
C. 相关信息与资料
D. 技术资料调查

知识点（角动量守恒与外力矩的关系）刚体角动量守恒的充分而必要的条件是

A. 刚体不受外力矩的作用
B. 刚体所受合外力矩为零
C. 刚体所受的合外力和合外力矩均为零
D. 刚体的转动惯量和角速度均保持不变