单项选择题

局部通风机及其启动装置安设在进风巷道中，地点距回风口大于()

A、5
B、7
C、10
D、15

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单项选择题

ENCRYPT_TS is an encrypted tablespace that contains tables with datA.Which statement is true regarding the effect of queries and data manipulation language (DML) statements on the encrypted data in the tables?（）A.The data is decrypted during SORT and JOIN operations.B.The data remains encrypted when it is read into memory.C.The data remains encrypted when it is stored in the redo logs.D.The data remains encrypted in the UNDO tablespace provided that the UNDO tablespace was created with the encryption option enableD.

单项选择题

‎在非饮用水管道上接出水嘴或取水短管时，应采取（）的措施。‍

A．防止回流
B．防止污染
C．防止误饮误用
D．消毒

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