【判断题】CODMn 测定时, KMnO4 和 Na2C2O4 可互相滴定。( ) 7 .酸雨是指 pH ≦ 7 的一切降水。( ) 8 .总铬测定时,用 NO2- 还原 KMnO4 ,然后再用 CO ( NH2 ) 2 还原过量 NO2- 。( )
【简答题】~ This is my teacher,
Miss Yang. ~ ______________.A. How are you , Miss Yang ? B. How do you do , teacher ? C. Nice to meet you , Miss Yang .
【单选题】Miss Yang is ________ English teacher.
【单选题】~ This is my teacher, Miss Yang. ~ ______________.
A.
How are you , Miss Yang ?
B.
How do you do , teacher ?
C.
Nice to meet you , Miss Yang .
【判断题】楔形文字的产生与发展与进行会计记录有着密切的关系
【判断题】楔形文字的产生与发展与进行会计记录有着密切的关系。
【单选题】—Why did Miss Yang look so worried when we saw her? —Because she wondered __________.
A.
where did the other students go
B.
when would the policeman come
C.
what her students have done during the trip
D.
if her students had survived the earthquake
【单选题】乒乓球竞赛组织中,( )是点燃赛场激情最便捷有效的途径