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杂草按外部形态可分为哪几类？

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一般点火系的次级电压为（）V。

A. 1000~1500；
B. 10000~15000；
C. 20000~30000；
D. 1500~3000

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漏斗、漏咀堵塞的原因之一是（）。

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日本「节分」这个节日是要从家里驱走哪一种东西？（）

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You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named DB1 in the instance. In the database, a small percentage of data is modified everyday. Ever day in the morning, you have to create a read-only copy of the database for reporting purposes and make sure that you use as little disk space as possible. In the options below, which strategy should you use? （）

A. You should use database snapshots
B. You should use database backup and restore
C. You should use database backup and restore along with compression
D. You should use schema-bound views in a read-only database. The database resides on the same instance.

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