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【单选题】
以下化学用语描述正确的是( )A.
两个氢原子： H 2
B.
一个铁离子带两个单位正电荷： Fe 2+
C.
3 个氧分子： 3O 2
D.
钙元素的化合价为 +2价：
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举一反三
【简答题】短文填空。 In many countries, people t__________ (1) by car or by bike. They also get from place to place using p__________ (2) transport such as buses and trains. However, some people live in parts of the...
【简答题】请根据PPT中布置的作业内容与要求提交实验报告五
【简答题】每一代人都有自己的判断标准。 Each ____ has its own standards of judgement.
【单选题】2015年美国企业在信息系统硬件、软件和通信设备上花费了多少钱?
A.
大约1亿美元
B.
大约10亿美元
C.
大约1000亿美元
D.
大约1万亿美元
E.
大约10万亿美元
【单选题】In common with many countries, Britain has serious environmental problems. In 1952, more than 4,000 people died in London because of the smog. The government 【26】______ new laws to stop smog from coal...
A.
introduced
B.
comprehended
C.
embraced
D.
deduced
【单选题】In common with many countries, Britain has serious environmental problems. In 1952, more than 4,000 people died in London because of the smog. The government 【26】______ new laws to stop smog from coal...
A.
embraced
B.
comprehended
C.
introduced
D.
deduced
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