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【单选题】
25 °C 时, K (CaCrO 4 )=7.10 × 10 -4 , 则 CaCrO 4 在纯水中的溶解度为 ( )A.
2.66×10-2mol/kg
B.
5.70×10-2mol/kg
C.
2.66×10-3mol/kg
D.
1.92×10-2mol/kg
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举一反三
【单选题】Mike pretended ___ Chinese when I came into the classroom.
A.
to reading
B.
reading
C.
to be reading
D.
to be read
【简答题】轴心受压构件的屈曲形式有:( )( )和( )
【单选题】When I came into the classroom, I saw some girls _______ happily.
A.
cry
B.
talk
C.
to run
D.
laughing
【单选题】. ．When I came into the classroom , I found him _______ with his study.
A.
occupied
B.
occupying
C.
to be occupied
D.
was occupied
【简答题】用符号“ ¢ ” 或“ ∈ ” 填空: ( 1)−3 N , 0.5 N , 3 N ;
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