问题
填空题
吹扫和置换煤气设施内部的煤气，应用（）为置换介质，吹扫或引气过程中，严禁在煤气设备上栓拉电线，煤气设施周围（）。
答案
参考答案：蒸汽、氮气和烟气；40m内严禁火源
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吹扫和置换煤气设施内部的煤气，应用（）为置换介质，吹扫或引气过程中，严禁在煤气设备上栓拉电线，煤气设施周围（）。
参考答案：蒸汽、氮气和烟气；40m内严禁火源
Hi, everybody! Welcome to Taiwan! Now I would like to show you _ this island (岛). After that, you will find that it is as beautiful as many _ __ places in our country. Do you know anything about the Sun Moon Lake? You ___ask why people call it so. If you fly high up the lake and look down from the plane, you will find the answer by yourself. In the middle of this lake, there is a small island. People call it Pearl Island (珍珠岛) because it ___ like a pearl. On one side of Pearl Island, the lake is like the sun and on the other side it is like the moon. That is __ people call the lake the Sun Moon Lake. There are many mountains around this lake. The Ali Mountain is near the Sun Moon Lake. We will camp there ___ three days. You can also have a dance party with the local people. You can climb the mountain and watch the sun _ _ slowly in the west. Of course, you can ____ early and enjoy the beautiful sunrise (日出) in the morning. Now, do you think Taiwan is a wonderful place ?
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