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问题 不定项选择

如图所示，物体静止于水平桌面上，则

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A．桌面对物体的支持力的大小等于物体的重力，这两个力是一对平衡力

B．物体所受的重力和桌面对它的支持力是一对作用力与反作用力

C．物体对桌面的压力就是物体的重力，这两个力是同一种力

D．物体对桌面的压力和桌面对物体的支持力是一对平衡的力

答案

答案：A

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信息归纳。
                                                                      Notice
                                                                                                                                       November  22
    The students of Class 3, Grade 3 will go to the Red Star Village and help the farmers to get in rice. We will meet on the school playground at 7 o'clock on the morning of Saturday. Please get everything ready and take lunch with you. Be sure to put on the old clothes. And we will be back to school at half past five in the afternoon. Everyone should get there on time.
Miss  Liu
                                                               Information  Card
Date of the Notice(1)                                        
Date of the Notice(2)                                        
What to do(3)                                        
How to get there(4)                                        
Time to be back to school(5)                                        
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单项选择题

Internet的网络管理是使用的下面的协议。

A．SMTP

B．FTP

C．SNMP

D．TELNET
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