半自动闭塞正常情况下的行车凭证为出站信号机的绿色灯光。
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自动闭塞区间,通过信号机故障机时,应改用电话闭塞法行车。
A. 正确
B. 错误
You set the value of the SGA_TARGET initialization parameter to 1G to enable Oracle to automatically resize most of the memory components according to the current workload in the database. You issue the following statement: SQL> SELECT name, value, isdefault 2 FROM v$parameter 3 WHERE name LIKE ’%size%’; The output of this statement displays that the DB_CACHE_SIZE, SHARED_POOL_SIZE, LARGE_POOL_SIZE, and JAVA_POOL_SIZE initialization parameters contain a zero value. What does this imply?()
A. The SGA_TARGET initialization parameter cannot be set to a value less than 1G
B. The SGA_TARGET initialization parameter cannot be set to a value greater than 1G
C. The Memory Advisor of the Oracle Enterprise Manager 10g cannot be used to obtain advice on the important memory components of the SGA
D. The values of the DB_CACHE_SIZE, SHARED_POOL_SIZE, LARGE_POOL_SIZE, and JAVA_POOL_SIZE initialization parameters cannot be set manually.
E. No minimum limits are imposed on the DB_CACHE_SIZE, SHARED_POOL_SIZE, LARGE_POOL_SIZE, and JAVA_POOL_SIZE initialization parameters.
F. The Automatic Shared Memory Management feature cannot be disabled unless you specify values for the DB_CACHE_SIZE, SHARED_POOL_SIZE, LARGE_POOL_SIZE, and JAVA_POOL_SIZE initialization parameters in the initialization parameter file.
马云在其卸任阿里巴巴集团CEO职位的演讲上说:“大家还没搞清PC时代的时候,移动互联网来了,还没搞清移动互联网的时候,大数据时代来了,”大数据是指数据规模巨大,类型多样且信息传播速度快的数据体系。它在生产经营、日常消费、商务活动等诸多领域源源不断的产生、积累、变化和发展,己经被越来越多的企业视作重要的生产要素。大数据时代的到来,有助于企业() ①及时掌握数据——加速转型升级——避免激烈竞争 ②把握市场动向——定位消费需求——实现适销对路 ③加强市场监管——提升服务质量——增强竞争优势 ④制定营销战略——合理配置资源——调节生产规模
A. ②④
B. ②③
C. ①③
D. ①②