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this allows you to minimize the overhead of handling asynchronous events.
process control support in php is not enabled by default. you have to compile the cgi or cli version of php with --enable-pcntl configuration option when compiling php to enable process control support.
although distance learning has a long history going back to the use of correspondence courses in the nineteenth century, the development of technologies enabling synchronous and asynchronous communication across time and distance has vastly increased the potential of and interest in distance learning.
尽管远程学习历史悠久,可追溯到十九世纪的函授课程,而且由于技术的发展能够超越时间和距离,可进行同步和异步通讯,大大提高了远程学习的潜力和人们的兴趣。
blend appropriate approaches and limit the number of applications and platforms: blend tools or media that are available for most students, both for synchronous communication and lessons, and for asynchronous learning.
结合使用多种适当的方法,并限制应用程序和平台的使用数量:结合使用对大多数学生可用的工具或媒体,用于同步通信、课程学习和异步学习。
asynchronous or clocked synchronous serial communication interface(sci,irda) x 2 chasynchronous or clocked synchronous serial communication interface(sci,irda) x 2 ch
时钟异步或同步串行通信接口(sci、irda)×2通道时钟异步或同步串行通信接口(sci、irda)×2通道
state-of-the-art broadband technologies like dsl (digital subscriber lines) and pri (primary rate interface) are now available, and frame relay, fiber and atm (asynchronous transfer mode) are now offered commercially.
现在已有数字用户线路和主速率接口等最新的宽带技术,而且还商业性地提供帧中继、光纤和异步传输方式。