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集体合同的内容主要有哪些？

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企业（）和（）应经过培训考核，取得有效的培训合格证书。

You created a profile APP_USER and assigned it to the users. After a month， you decide to drop theprofile.Some user sessions are currently connected to the database instance and are using the APP_USERprofile. This command is used to drop the profile： SQL> DROP PROFILE app_user； Which statement describes the result（）

A. The command produces an error.
B. The profile is dropped and current user sessions use the DEFAULT profile immediately.
C. The profile is dropped and only the subsequent user sessions use the DEFAULT profile.
D. The profile is dropped， the sessions are terminated， and the subsequent user sessions use theDEFAULT profile.

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单位时间通过某一截面的流体量叫（）。

A. 流量
B. 流速
C. 速度
D. 流体

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在旧房装修过程中，旧墙皮是否需要铲除？

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