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造成农产品中农药残留超标的主要原因有哪些？

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合同或订单中货物交货期一般有哪几种规定方法？

You work as a database administrator for Certkiller .com. In the middle of a transaction， a user session was abnormally terminated but the instance is still up and the database is open. Which two statements are true in this scenario？（）

A. Event Viewer gives more details on the failure.
B. The alert log file gives detailed information about the failure.
C. PMON rolls back the transaction and releases the locks.
D. SMON rolls back the transaction and releases the locks.
E. The transaction is rolled back by the next session that refers to any of the blocks updates by the failed transaction.
F. Data modified by the transaction up to the last commit before the abnormal termination is retained in the database.

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协调的效应；可以从宣传报道的宏观上对报道发挥协调各平衡的功效

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从执勤保安员视线的角度考虑，设立保安门卫岗位应坚持（）的原则。

A. 有利于观察
B. 有利于查验
C. 有利于防范
D. 有利于工作

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