【单选题】I am a new _______、I was hired yesterday.
【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.
【简答题】you a student? Yes , I am. I am a new student.
【单选题】I have no one ______ me, for I am a new comer here.