【单选题】关于合同下列哪项是错误的
A.
合同是平等主体的自然人、法人、其他组织之间的
D.
合同是设立、变更、终止民事权利义务关系的协议
【单选题】Althoug h I am a new driver , I _____ in my driving skills.
【简答题】Calculate the hydroxide ion concentration,the percent reaction,and the pH of a 0.050mol·L -1 solution of sodium acetate. (For acetic acid, ).
【单选题】I am a new_____ . I was hiredyesterday.
【单选题】I have no one ()me, for I am a new comer here.
【简答题】在案例“椅子放在不平的地面上”中,假设椅脚连线为长方形,其余不变,建立模型并求解。