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【单选题】
下列反应的离子方程式书写正确的是A.
铁粉与稀H 2 SO 4 反应:2Fe+6H + =2Fe 3+ +3H 2 ↑
B.
Na 2 CO 3 溶液与足量盐酸反应:CO 3 2- +2H + =CO 2 ↑+H 2 O
C.
Cu(OH) 2 固体与稀H 2 SO 4 反应: OH - +H + = H 2 O
D.
铝片与NaOH溶液反应:Al+OH - +H 2 O=AlO 2 - + H 2 ↑
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反馈参考答案：
举一反三
【单选题】As a child you always assume that your parents are there to _____your needs.
A.
turn to
B.
extend to
C.
log on
D.
attend to
【判断题】The more you assume your audience knows about your informative speech topic, the greater are your chances of being misunderstood.
A.
正确
B.
错误
【单选题】S1: How does she answer? S2: No answer. Q: How is the steering? _____
A.
Answers all right
B.
Answers too slow
C.
No answer.
D.
Very slow
【简答题】简述常用有机氯农药特性。
【判断题】The more you assume your audience knows about your speech topic, the greater are your chances of being misunderstood.
A.
正确
B.
错误
【简答题】影响混凝土和易性的因素有哪些?采取哪些措施改善混凝土的工作性?
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