Since cordite burns at a greater rate at a higher pressure a relief valve must be used to allow generated gas to escape to atmosphere at times when the demand is low.
In a testing of petrolic engine, about 70% to 80% of nonmethane hydrocarbon is emitted into atmosphere without catalysis conversion in theoment of coldstart, so that serious pollution is produced.
On condition that the front body shape of the projectile is unchangeable,a formula is obtained for determining the relation between the optimum boattail angle and the supersonic flight region.
After three of postdoctoral study at UCSD, he went to Germany in 1978 to work at the Max-Planck-Institute for Aeronomy (now MPI for Solar System Research).
Rested in the Pacific Ocean, Mauna Kea's peak rises above the bulk of our planet's dense atmosphere, where conditions allow telescopes to obtain images of unsurpassed clarity.
It told of how scientists rode a balloon to an altitude of 80,000 feet to make telescope observations of Venus's atmosphere and how their discovery of water raised hopes that there could be living things there.
化着大
道的。
所禁止。
业、野火和汽车会释
出造成污染的
室气体，
星进入地球
