对于无高度稳定的飞机，货物投放会引起飞行高度的降低。
For the aircraft without altitude stabilizer, airdrop will induce a decrease of the flight altitude.
通过正交偏光显微镜观察研究，发现所得到的化合物是呈现高度稳定的近晶A相和向列相的新型互变液晶。
Study by polarizing microscopy showed that they were enantiotropic liquid crystals with highly stable smectic a and nematic phases.
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