问题
单项选择题
尾矿库安全度主要根据尾矿库防洪能力和尾矿坝稳定程度分为危库、险库、病库和正常库四级。下列关于尾矿库工况的描述中，属于危库工况的是（）。
A.排洪系统严重堵塞或坍塌
B.排洪系统部分堵塞或坍塌，排水能力达不到设计要求
C.排洪设施出现不影响正常使用的裂缝、腐蚀或磨损
D.坝体抗滑稳定最小安全系数小于规定值的98%
答案
参考答案：A
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尾矿库安全度主要根据尾矿库防洪能力和尾矿坝稳定程度分为危库、险库、病库和正常库四级。下列关于尾矿库工况的描述中，属于危库工况的是（）。
A.排洪系统严重堵塞或坍塌
B.排洪系统部分堵塞或坍塌，排水能力达不到设计要求
C.排洪设施出现不影响正常使用的裂缝、腐蚀或磨损
D.坝体抗滑稳定最小安全系数小于规定值的98%
参考答案：A
| 阅读理解。 | |||
| 完形填空。 One day, Jenny is 1____________ the bus. She is looking 2____________ the window of the bus. She sees a big green tree. There is a baby and her mother 3____________ behind Jenny. The baby is crying. She is loud. There is a boy and his father sitting in front of Jenny. They 4____________ talking. Jenny is going to 5____________ her grandma and grandpa. She loves them very much.
( ) 6. There is a boy and his father sitting behind Jenny. ( ) 7. The baby is crying and she is very loud. ( ) 8. Jenny loves her grandma and grandpa very much. |