Many missions, however, require a spacewalk, perhaps to deploy a satellite or make repairs. During a spacewalk, an astronaut must wear a space suit -- what NASA calls an extravehicular mobility unit (EMU) -- to
A .Its construction has been completedB .It can be helpful to further space exploration.C .It only conducts experiments from China.D .Permanent human operations in orbit is impossible. 6.What does the paragraph 3 tell? A .Some high-tech equipmentB .Ways to cook food in space.C .Life su...
Crews unload the planes cargo of more than half a million parcels and letters. The rectangular packages and envelopes are rapidly reshuffled and sorted according to a 40、ddress, then loaded onto other aircraft, and flown to their destinations to be dispersed by hand many within 24 hours of ...
Many airports also use bomb-sniffing dogs to check out unattended bags, garbage cans and vehicles. Airports complement their police forces with separate crews to handle fire and emergency medical services (EMS). An airport may have several fire/EMS stations on the ground because the FAA requires...
The NASA administration soon split into two camps, each vehemently defending its favoured approach. In many cases preferences were driven by more than simply numbers; for example, Earth Orbit Rendezvous would require the construction of a space station, a lifelong dream of Wernher von Braun’s ...
Day 2: Head to the Royal Mile and begin the day at Edinburgh Castle on one end and then heading to Holyrood Palace which stands at the opposite end. Visit Edinburgh Castle in the morning when it opens, stroll down the Royal Mile (there are many shops and museums along the way) and...