请帮忙翻译一下
companyA must ensure that GSM onboard aircraft is operated according to the terms set by governing authority for telecommunications regulatory in China in the apparatus assignment, and must ensure full compliance with all regulatory conditions for using the service in China.
All responsibilities and obligations directly and indirectly associated with the corresponding apparatus assignment shall be assumed by companyA. companyAmust assume all obligations towards the governing authority for telecommunications regulatory in China, and will be responsible for any consequences following any breaches of the conditions listed in the regulatory approval. In the unlikely case of any infringement with the regulatory conditions, companyA must rectify this situation immediately.
某英语教材中有下面这句话：
No black person was to ride a bus on Monday, December5, the day that Mrs. Parks came to trial.
请问，定语从句的先行词是day ,为什么用 that引导？ 一般不是用what 吗？
回复人： 回复时间：2008-5-12 15:50:32
the day 在此与 Monday,December5同位，that 引导的是限制性定语从句。限制性定语从句以that 引导是常见的现象。句子里的日期已是特定的，其后的定语从句自然是限制性的了。例如:
Can you mention any one that we know?
Everything that could be done was done.
在表示时间的情况下，如果用 that可以代替at which， in which, on which则往往用that. 例如：
This is the time that the unjust man doth thrive.(莎士比亚)
By the time (that) you are ready, everybody will be gone.
The moment (that) the teacher entered ,everybody stopped their chatter.
提问人：syh78 提问时间：2008-2-27 17:36:09