下列什么钥匙不属于值班站长进行保管()
A、票务管理室门钥匙
B、保险柜钥匙
C、钥匙柜门钥匙
D、票务中心门钥匙
参考答案:A, B, C
根据句意及所给首字母提示,完成下列句子。
1. He doesn't like g , but he likes math.
2. They like English very much. Look! They are p speaking English over there.
3. We want to go to Beijing by plane, but he makes the s that we go by train.
4. How do you usually s the weekend?
5. Did you study for the English t ?
煤的元素组成是指煤中有机组分中的主要元素。它们是碳、氢、氧、氮、硫等五种元素。其中,煤中的()是组成煤的有机高分子的最主要元素。
A、碳
B、氢
C、氧
D、硫