question:
It is also equivalent to mass, and this mass is always associated with it.
Mass is also equivalent to what?

answer: no

question:
Sometimes, political, social and economic circumstances, and public opinion are the reason for others parties' failure.
When are opposition parties allowed?

answer: no

question:
Also available to the Americans at the start of the war was the 120 mm M1 gun stratosphere gun, which was the most powerful AA gun with an impressive 60,000 ft (18 km) altitude capability.
What was the altitude range in feet of the stratosphere gun?

answer: yes

question:
NigComSat-1R was also a DFH-4 satellite, and the replacement for the failed NigComSat-1 was successfully launched into orbit by China in Xichang on December 19, 2011.
Where was Nigeria's fourth satellite launched?

answer:
yes