【多选题】第二次世界大战后,西方国家跨国公司迅速发展是由于
【简答题】板框过滤机主要用于培养基制备的过滤及霉菌、放线菌、酵母菌和细菌等多种发酵液的固液分离,比较适合固体含量()的悬浮液的分离
【简答题】简述喷雾干燥法的原理是什么?其优缺点有哪些?
【单选题】关于干燥方法错误的是( )
C.
冷冻干燥产品外观优良、易于溶解,可以长期保存,但设备成本过大
D.
微波干燥的特点是穿透力强,加热效率高,有杀虫灭菌效果
【多选题】二次世界大战后,西方国家跨国公司迅速发展是由于( )
【多选题】关于板框过滤说法正确的有
B.
主要应用于培养基制备过滤、霉菌、放线菌、酵母菌和细菌发酵液的固液分离
【简答题】Car companies should help people better understand electric cars. fuel prices are high, more people will buy electric cars if they know that electric cars can save them money in the long term.
【单选题】In one year, you meet 52 people who are each unemployed for one week and eight people who are each unemployed for the whole year. What percentage of the unemployment spells you encountered was short t...
A.
52% was short term; 13.3% was long term
B.
52% was short term; 88.9% was long term
C.
86.7% was short term; 13.3 was long term
D.
86.7% was short term; 88.9 was long term
【多选题】以下说法错误的是
A.
极性液体电介质(如蒸馏水)在电气绝缘中应用较广
B.
选择电容器的绝缘材料时,通常选择介电常数小的材料
C.
选择电缆的绝缘材料时,通常选择介电常数大的材料