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【单选题】
Na 2 CO 3 可形成三种水合物:Na 2 CO 3 ·H 2 O、Na 2 CO 3 ·7H 2 O、Na 2 CO 3 ·10H 2 O,在常压下,将Na 2 CO 3 投入混合物中达三相平衡时,若一相是冰,一相是Na 2 CO 3 水溶液,则还可能有几种水合Na 2 CO 3 存在A.
0 种
B.
1 种
C.
2 种
D.
3 种
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举一反三
【简答题】翻译下列短语 1. for the first time 2. be supposed to 3. make some mistakes 4. do something together 5. 约会
【单选题】'Some dealers were quite bearish towards dollar.' What does 'bearish' mean in this sentence ?
A.
Looking like a bear.
B.
Taking an attitude of a bear.
C.
Thinking the price would drop.
D.
Making sth. as a bear.
【简答题】动词填空： 1. Let's _________ (go) to the Reading Club. 2. We cut some shapes __________ (make) the eyes and the sharp teeth. 3. He enjoys __________ (chat) with his friends after class. 4. Look! The boys ...
【简答题】用burn构成的短语的适当形式填空 1. Put some wood on the fire and make it . 2. The fire .so we had to restart it. 3.In the big fire his house was . 4. Half of the candle had, so we had better go to sleep.
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