试题与答案

脑和脊髓组成[ ] A.周围神经系统 B.中枢神经系统 C.神经中枢 D.神经元

题型:选择题

题目:

脑和脊髓组成[      ]

A.周围神经系统  

B.中枢神经系统  

C.神经中枢  

D.神经元

答案:

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(1)4m/s(2)60N(3)16J(4)0.2(1)根据机械能守恒定律(以B点所在水平面势能为零)B点时速度为(2)B点时物体所受重力和支持力的合力提供向心力物体对轨道的压力跟支持力大小相等为:(3)根据动能定理:可...

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小题1: A. China          B. Chinese             C. English    

小题2: A. in                 B.on                   C. at             

小题3: A. like         B. is like       C. likes        

小题4: A. After         B. How                   C. When

小题5: A. help                B. is helping          C. helps      

小题6: A. clean          B. cleans           C. cleaning  

小题7: A. but              B. /               C. so             

小题8: A. some          B. other            C. others  

小题9: A. In                 B. On                        C. At           

小题10:A. eats         B. is eating             C. eating 

小题11: A. any         B. much                   C. some              

小题12: A. hers                B. she                      C. her

小题13: A. nice                 B. more nice          C. nicer               

小题14:A. child     B. children              C. boys                

小题15: A. in          B. over                     C. on          

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