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问题 多项选择题

下列哪些说法是正确的（）。

A、室外沉淀池的周边必须建筑堤坝或配置栏杆，并设有明显的警示牌。禁止非工作人员入内

B、沉淀池滑线沟盖板应当采用花纹钢板

C、池内管道堵塞清理时，工作人员必须携带安全带、梯子等工具；同时，上面应当有专人监护

D、禁止任何人在尾矿场内游泳

答案

参考答案：A, B, C, D

填空题



Earthquakes often happen near volcanoes, but this is not always true. The centers of some are (1) . The bottom of the sea suddenly (2) . The powerful forces inside the (3) break the rocks. The coast is shaken and great waves appear. These waves travel (4) and rush over the land when they reach it. They are p enough to (5) houses and other buildings; sometimes they break (6) than the earthquake itself.
Very often fires followed the (7) earthquakes. In 1906, the great earthquake at San Francisco broke the gas-pipes. The gas (8) , and soon large numbers of fires were burning in the city. The water-pipes were also (9) ; so it was not possible to put the fires out. There was (10) . The Tokyo earthquake of (11) happened just before the middle of the day. People were (12) on their fires at that time. When the ground shook, the fires shook too. (13) were thrown on the different parts of the houses, some of which were (14) . Soon 134 fires were burning in the city. What kind of building (15) in an earthquake A building with concrete walls is perhaps the best. A (16) will make it even per. The frame holds the (17) together, and the walls do not easily fall. There is (18) of fire because concrete and steel do not burn. The Americans (19) the results of the earthquake in San Francisco, and they are convinced that this kind of building is the (20) .
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单项选择题

（）是导出量。

A.物质的量（n）

B.质量（m）

C.物质的量浓度C.

D.电流（I）
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