The space shuttle.
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A reusable spacecraft is typically called a space shuttle or a reusable launch vehicle. These spacecraft are designed to be launched into space multiple times, reducing the cost of space missions.
most cost-efficient
No because they have run out of fuse or power. However, ther are some highly expensive airsoft grenades that cost like $250 and are reusable.
A reusable My K Cup costs about fifteen dollars. You can find one on the following website: http://www.amazon.com/Keurig-K-Cup-Reusable-Coffee-Filter/dp/B000DLB2FI.
most cost-efficient
Reusable hand warmers can be purchased at outdoor stores like REI. They are more environmentally friendly than disposable ones. They may cost more too.
Obviously we don't. The idea behind the Shuttle was to be a cost effective, reusable transport.
Yes timber is reusable, because it is wood and wood is reusable.
is oil reusable?
how much did it cost the venice seawall to be built
Because it is a very efficient language for describing their operation as well as a tool to assist in design optimization (reducing the cost of the circuit when built).