采煤机上的控制按钮，必须设在靠（）一侧，并加（）。_爱下问搜题

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问题填空题

采煤机上的控制按钮，必须设在靠（）一侧，并加（）。

答案

参考答案：采空区；保护罩

完形填空

When you wave to a friend, you are using sign language. When you smile at someone , you mean to be 16 . When you put one finger in front of your 17 , you mean“Be quiet.”
Yet , people in different countries may use different sign languages.
Once an Englishman was in Italy. He could speak 18 Italian. One day while he was walking in the street , he felt 19 and went into a restaurant. When the waiter came , the Englishman 20 his mouth , put his fingers into it and took them out again and moved his lips. In this way , he 21 to say , “Bring me something to eat.”But the waiter brought him a lot of things to 22 . First tea , then coffee , then milk , but no food. The Englishman was 23 that he was not able to tell the waiter he was hungry. He was 24 to leave the restaurant when another man came in and put his hands on his stomach. And this sign was 25 enough for the waiter. In a few minutes, the waiter brought him a large plate of bread and meat. At last the Englishman had his meal in the same way.

推断题

某兴趣小组从铜器上取下绿色粉未，设计如下实验步骤探究铜绿的组成．

（1）推断B、C是何种物质，写出它们的化学式：B_________；C_________．

（2）从图中转化关系可以初步判断，铜绿的组成元素有_________．

（3）图中第③步反应的化学方程式是_________．

（4）图中第⑤步反应的化学方程式是_________．