问题
单项选择题
()是支架掩护后部和实现放顶煤的关键部件。
A.尾梁
B.顶梁
C.插板
D.尾梁千斤顶
答案
参考答案:A
()是支架掩护后部和实现放顶煤的关键部件。
A.尾梁
B.顶梁
C.插板
D.尾梁千斤顶
参考答案:A
阅读短文,回答问题。 | ||||||||
Here is a map of the United States. It's yellow. The U. S. is a beautiful country. In the U. S. they speak English. Look at the girl, she is from the U. S. She has short, curly and blond hair. She lives in New York. Look at the Statue of Liberty. It's white. Do you know this flag? It has three colours, blue, white and red. It has fifty white stars, red and white stripes. It's very beautiful.
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