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【多选题】
下列关于吸附指示剂说法中正确的有()。A.
吸附指示剂是一种有机染料
B.
吸附指示剂能用于沉淀滴定中的法扬司法
C.
吸附指示剂指示终点是由于指示剂结构发生了改变
D.
吸附指示剂本身不具有颜色
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举一反三
【单选题】Do you think the Jacksons will help?We’ve known them since______.
A.
a long time
B.
last Christmas
C.
a few weeks
D.
two months
【简答题】每本练习本x元，8本练习本共______元．
【单选题】A lot of tents, drinking water and food __________ to the homeless earthquake survivors in the past several weeks.
A.
are sent
B.
were sent
C.
have been sent
D.
had been sent
【简答题】Do you know the reason （ ）she was late.A. why
【单选题】Obviously the measures taken by the local government have ______________ the solution to drinking water problems in this region.
A.
contributed to
B.
referred to
C.
turned to
D.
devoted to
【简答题】练习本每本a元，买8本要用______元．
【简答题】8.Do
you think the new engineer can help me my operating skills?A. A)improves B. B)improved C. C)improve D. D)has improved
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