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【单选题】
Na 2 CO 3 可形成三种水合盐:Na 2 CO 3 ꞏH 2 O、Na 2 CO 3 ꞏ7H 2 O及Na 2 CO 3 ꞏ10H 2 O,常压下当将Na 2 CO 3 (s)投入其水溶液中,待达三相平衡时,一Na 2 CO 3 水溶液,一Na 2 CO 3 (s),则另一:A.
冰
B.
Na 2 CO 3 ꞏ10H 2 O(s)
C.
Na 2 CO 3 ꞏ7H 2 O(s)
D.
Na 2 CO 3 ꞏH 2 O(s)
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举一反三
【单选题】_____ I got to the cinema, the film had already been on. [ ]
A.
From the time
B.
In the time
C.
By the time
【单选题】By the time I got to school, I realized that I ______ my pen at home. [ ]
A.
have forgotten
B.
have left
C.
had forgotten
D.
had left
【简答题】(辨析题)个体的道德认识与道德行为是一致的。
【简答题】辨析题:个体的道德认识与道德行为是一致的。
【单选题】By the time I locked the door, I realized I ( )my keys at home
A.
had repaired
B.
have forgotten
C.
had forgotten
D.
had left
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