红外光束线型感烟火灾探测器的探测区域长度不宜超过()m。
A. 200
B. 150
C. 100
D. 50
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JC475-2004标准规定,无氯盐防冻剂的氯离子含量要求不大于()
A. 0.15%
B. 0.10%
C. 0.05%
D. 0.20%
支配大气运动状态和热力状态的基本物理定律有哪些?大气运动方程组一般有几个方程组成?哪些是预报方程?哪些是诊断方程?
脑血管造影是确诊颅内动脉瘤必须的检查方法,对判断动脉瘤的准确位置、形态、内径、数目、血管痉挛和确定手术方案都十分重要。
A. 正确
B. 错误
Which three attributes of the LOG_ARCHIVE_DEST_n initialization parameter control the data availability mode of a Data Guard standby database? ()
A. SYNC or ASYNC to identify the network transmission mode.
B. LGWR or ARCH to identify the primary database process responsible for sending redo information to the standby.
C. AFFIRM or NOAFFIRM to control whether log archiving disk write operations are to be performed synchronously or asynchronously.
D. PROTECTED or UNPROTECTED to control the degree of divergence and data loss at the standby database.