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【单选题】
在什么情况下液体培养的好氧微生物生长只受到氧的影响( )A.
溶解氧小于临界浓度
B.
溶解氧浓度大于临界浓度
C.
溶解氧浓度大于氧的饱和浓度
D.
溶解氧浓度处于临界浓度和饱和浓度之间
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举一反三
【简答题】已知：A公司2004年的销售收入为40 000元，营业资产为16 000元；B公司2004年的销售收入为100 000元，营业资产为20 000元。如果两家公司均希望其2004年的投资利润率达到15％。 要求：分别计算A、B公司在2004年的销售利润率。
【简答题】内部过电压与电网结构、各项参数、运行状态、停送电操作等多种因素有关。()
【单选题】To swim across the English Channel takes at least nine hours. It's a hard work and it makes you short of breath. To fly over the Channel takes only twenty minutes (as long as you're not held up at the...
A.
Swimming across the Channel takes less than four hours.
B.
The idea of a Channel tunnel or bridge is a very new one.
C.
It is considered to be more difficult to swim across the channel than any other means.
D.
A tunnel or bridge would only reach as far as the coast.
【单选题】判断下列句子哪两句是比喻句( )。 1.有的还是花骨朵儿,看起来饱胀得马上要破裂似的。 2.我忽然觉得自己仿佛就是一朵荷花,穿着雪白的衣裳,站在阳光里。 3.二月春风似剪刀。 4.电杆之间连着几痕细线,多么像五线谱啊!
A.
①②
B.
③④
C.
①③
D.
①④
【单选题】To swim across the English Channel takes at least nine hours. It's a hard work and it makes you short of breath. To fly over the Channel takes only twenty minutes (as long as you're not held up at the...
A.
Swimming across the Channel takes less than four hours.
B.
The idea of a Channel tunnel or bridge is a very new one.
C.
It is considered to be more difficult to swim across the channel than any other means.
D.
A tunnel or bridge would only reach as far as the coast.
【简答题】简述如何对文档进行分栏操作？
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