How much do resident doctors earn?
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While the rocket is inside, technicians will remove and inspect suspected helium system components, update any faulty hardware, and perform other work. That includes replacing batteries in the flight termination system — the emergency system that can destroy the rocket if it strays off course — swapping out a seal on the line that feeds liquid oxygen into the rocket, refreshing items inside Orion, and giving the closeout crew more practice sealing the capsule.。关于这个话题，Line官方版本下载提供了深入分析
请去寻找那些不变的、或不应改变的事物：