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简述我国土壤污染物的主要来源

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吊环是吊装作业中的取物工具。

A. 正确
B. 错误

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铁丝在氧气中燃烧，生产物质量比铁丝质量大

A. 正确
B. 错误

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在同一块田地上种植一种作物的种植方式称为（）

A. 单作
B. 间作
C. 套作
D. 混作

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You are working as a DBA on Oracle Database 9i. You plan to upgrade your 9i database to Oracle 10g. To be familiar with the new database technology， you decide to install Oracle Database 10g on your workstation at home. You create a general purpose database. After the installation， you make the following changes in your initialization parameter file：LOG_ARCHIVE_DEST_1=’LOCATION=USE_DB_RECOVERY_FILE_DEST’ DB_RECOVERY_FILE_DEST = ’LOCATION=d：\product\10.1.0\flash_recovery_area’ DB_RECOVERY_FILE_DEST_SIZE=10g Where are the archived redo logs stored for your database？（）

A. The archived redo logs are stored in an operating system-dependent location.
B. The archived redo logs are stored in the location specified by LOG_ARCHIVE_DEST_1.
C. The archived redo logs are stored in the location specified by DB_RECOVERY_FILE_DES
D. The archived redo logs are stored in the locations specified by both LOG_ARCHIVE_DEST_1 and DB_RECOVERY_FILE_DES

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