题目内容

如何处理第三产程，以预防产后出血？

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只要发热就应立即给予退烧药来降温。

A. 正确
B. 错误

能够造成矿井重大灾害的气体是（）。

A. CO
B. CO₂
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集合地点应保证人均至少占地（）平方米。

A. 0.35
B. 0.50
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An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command: SQL>CREATE INDEX ord_custname_ix ON orders(custname); The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause. You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test.Which is the most efficient method of performing this task?（）

A. disabling the index
B. making the index invisible
C. making the index unusable
D. using the MONITORING USAGE clause for the index