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焊接作业的个人防护措施有哪些？

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中国电信宽带互联网分为（）和（）两层结构。

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在波渠天线中，反射器的长度（）有源振子。

A. 长于
B. 短于
C. 一样
D. 都可以

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人寿保险的被保险人或受益人对保险人请求给付保险金的权利，自其知道保险事故发生之日起（）不行使而消灭。

A. 2年
B. 5年
C. 3年
D. 1年

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Consider the following command to create a tablespace in your production database （which is using an Automatic Storage Management [ASM] instance to manage the database files）： CREATE TABLESPACE user_tbsp DATAFILE ’+dgroup3（user_temp）/user_files/user_tbsp’ SIZE 200M； What would be the result of this command？（）

A. It would result in an error because the template cannot be used along with the disk group.
B. It would result in an error because the path cannot be specified while creating a tablespace in a disk group.
C. It would create a tablespace with a data file that has an alias， and its attributes are set by the user-defined template.
D. It would create a tablespace with a data file that does not have an alias， and its attributes are set by the user-defined template.

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