Problem: Although little was officially announced by Chinese authorities about the signals of the new system, the launch of the first COMPASS satellite permitted independent researchers not only to study general characteristics of the signals, but even to build a COMPASS receiver.
What is another thing launching the first COMPASS satellite enable researchers to do?
The answer is the following: to build a COMPASS receiver

Problem: Greek culture has evolved over thousands of years, with its beginning in the Mycenaean civilization, continuing through the Classical period, the Roman and Eastern Roman periods and was profoundly affected by Christianity, which it in turn influenced and shaped. Ottoman Greeks had to endure through several centuries of adversity that culminated in genocide in the 20th century but nevertheless included cultural exchanges and enriched both cultures. The Diafotismos is credited with revitalizing Greek culture and giving birth to the synthesis of ancient and medieval elements that characterize it today.
Which devotion of time was heavily influenced by the religious followers of the  Son of God ?
The answer is the following: the Roman and Eastern Roman periods and was profoundly affected by Christianity

Problem: The United States Air Force (USAF) is the aerial warfare service branch of the United States Armed Forces and one of the seven American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on 18 September 1947 under the National Security Act of 1947. It is the most recent branch of the U.S. military to be formed, and is the largest and one of the world's most technologically advanced air forces. The USAF articulates its core functions as Nuclear Deterrence Operations, Special Operations, Air Superiority, Global Integrated ISR, Space Superiority, Command and Control, Cyberspace Superiority, Personnel Recovery, Global Precision Attack, Building Partnerships, Rapid Global Mobility and Agile Combat Support.
What is one of the functions of the USAF?
The answer is the following: Nuclear Deterrence Operations

Problem: The territory of modern-day Mexico was home to numerous indigenous civilizations prior to the arrival of the Spanish conquistadores: The Olmecs, who flourished from between 1200 BCE to about 400 BCE in the coastal regions of the Gulf of Mexico; the Zapotecs and the Mixtecs, who held sway in the mountains of Oaxaca and the Isthmus of Tehuantepec; the Maya in the Yucatan (and into neighbouring areas of contemporary Central America); the Purépecha in present-day Michoacán and surrounding areas, and the Aztecs/Mexica, who, from their central capital at Tenochtitlan, dominated much of the centre and south of the country (and the non-Aztec inhabitants of those areas) when Hernán Cortés first landed at Veracruz.
Who held sway in the mountains of Oaxaca?
The answer is the following:
the Zapotecs and the Mixtecs