一 | 神舟十八号载人飞船计划将于近日择机发射，今天（4月21日），酒泉卫星发射中心组织各单位展开全系统合练。 此次合练按照正式发射程序进行，在发射场系统的统一调度下，塔架、火箭、飞船等分系统进行功能检查，从飞行准备、点火起飞到船箭分离，实施全过程模拟演练。 Chinese President Xi Jinping, also general secretary of the Communist Party of China Central Committee and chairman of the Central Military Commission, will attend and address a grand meeting commemorating the centenary of the birth of late Chinese leader Jiang Zemin on Aug. 17. The event, scheduled to start at 10 a.m. at the Great Hall of the People in Beijing, will be broadcast live by China Media Group and xinhuanet.com. It will also be relayed simultaneously on websites of leading media organizations, including people.cn, cctv.com, and china.com.cn, as well as on mobile apps run by the People's Daily, Xinhua News Agency, and China Central Television. 
。神舟十八号航天员按流程模拟执行飞行任务，进入飞船返回舱后，开始人、船、箭、地联合检查测试，并在火箭模拟起飞过程中完成待发段和起飞段的全部关键操作。
二 | 这次全系统合练进一步检验了各系统在发射流程当中的可靠性和安全性。
三 | （总台央视记者 王刚 王晓丹 ）。
四 |
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