When you read a message from a queue, that message automatically becomes invisible to all other consumers of the queue until the visibility timeout period set for the queue expires. 在从队列中读取消息之后,队列的其他所有消费者就看不到这个消息,直到可见性超时周期过期为止。
The relationship between visibility and air pollution in Beijing area shows that during the period of ten years ( 1970 - 79 ), the mean visibility was decreased by 6-10 Km and, the frequency of visibility less than 4 Km in winter was increased by 10 times. 讨论了北京地区大气能见度变化与大气污染的关系.指出北京地区在10年内(19701979)平均大气能见度降低610公里,在采暖期低于4公里的能见度出现几率增加了10倍。
The factors such as bridge span, flooding period, visibility also have an effects on the probability of ship bridge collision, especially flooding period greatly influences the probability which approaches normal distribution; 船撞桥的概率与桥梁跨距、洪水、能见度等因素有关,尤其是洪水对船撞桥概率影响较大,近似呈正态分布。
The shoot of high speed video camera and the technology of image manipulation are applied to test and study bubble pulsation parameters according to the optical visibility of underwater blasting. The track of bubble diameter changing with time and the pulsation period of 0.3g DDNP charge are obtained. 利用水下爆炸的光学可见,在浅水水体外将CCD高速摄像机实拍和图像处理技术引入了气泡脉动参数的测试研究,得到了0.3gDDNP装药的气泡半径随时间变化轨迹和脉动周期。
Applying the data flow diagram in the information processing can improve the visibility and ability of control of the software analysis, and will be useful for finding and clearing the faults of software in the early developing period. 在信息处理系统中应用数据流图可提高软件分析的可见性和可控性,有助于软件缺陷在软件开发阶段早期被及时发现和消除。