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《春蚕》描述的是30年代淞沪战役前后江南农村蚕农老通宝一家养蚕（）的悲惨事实。

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涂型防火涂料表面裂纹宽度不应大于()mm，厚涂型防火涂料表面裂纹宽度不应大于()mm。

A. 0.5 1.0
B. 1.0 1.5
C. 1.5 2.0

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高碑店污水厂中水滤池的滤速为（）

A. >20m/hr
B. 5-10m/hr
C. 1-3m/hr
D. <1m/hr

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You installed Oracle Database 11g and are performing a manual upgrade of the Oracle9i database. As a part of the upgrade process，you execute the following script： SQL>@utlu111i.sql Which statement about the execution of this script is true？（）

A. It must be executed from the Oracle Database 11g environment.
B. It must be executed only after the SYSAUX tablespace has been created.
C. It must be executed from the environment of the database that is being upgraded.
D. It must be executed only after AUTOEXTEND is set to ON for all existing tablespaces.
E. It must be executed from both the Oracle Database 11g and Oracle Database 9i environments.

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160km/h以上运行区段，锚段长度在800m及以上的接触线接头的数量限界值不得超过（）。

A. 2个
B. 3个
C. 4个
D. 5个

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