Cottonseed oil is classed as a().
A. combustible liquid
B. flammable liquid
C. flammable solid
D. poison B
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平面多面体表面的平面多边形的边最多属于两个多边形,即它的表面具有二维流形的性质。
A. 正确
B. 错误
Monitoring is especially important in a highly automated system which is dependent on careful()procedure and format.
A. adherence to
B. adoption to
C. relaying on
D. usage of
实验室进行蒸馏操作时,对于爆炸性物质或不稳定物质,须小心地蒸馏直到剩余少量残渣。
A. 正确
B. 错误