苯的产率以干煤计约为:
0.9%-1.1%;苯及其同系物(80%-95%);不饱和化合物(5%-15%);硫化物0.2%-2.0%
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
计算题:从某选煤厂某月的原煤浮沉试验综合表可知:-1.30g/C、m3的产率为10.69%;1.30~1.40g/C、m3的产率为46.15%,问~1.40g/C、m3的累计浮物产率是多少?
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