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拆卸水泥头时必须首先做什么？

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亚运会裁判员、技术官员是怎么选派的？

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乳酸发酵和乙酸发酵都是在厌氧条件下进行的

A. 正确
B. 错误

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The tnsnames.ora file has an entry for the service alias ORCL as follows:The TNS ping command executes successfully when tested with ORCL; however, from the same OS usersession, you are not able to connect to the database instance with the following command:SQL > CONNECT scott/tiger@orcl What could be the reason for this?（）

A. The listener is not running on the database node.
B. The TNS_ADMIN environment variable is set to the wrong value.
C. The orcl.oracle.com database service is not registered with the listener.
D. The DEFAULT_DOMAIN parameter is set to the wrong value in the sqlnet.ora file.
E. The listener is running on a different port.

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如果利率是5%，一年后的100美元的现时贴现值是多少（）

A. 105美元
B. 85美元
C. 90美元
D. 95美元

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