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【简答题】
定轴转动刚体上任意一点切向加速度的方向与刚体( )的转向一致。(请在角速度,角加速度,速度,加速度中选择)
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举一反三
【简答题】生活污水中含有 、病原菌。虫卵等,排入水体或渗入地下水将造成污染,当溶解氧低于 mg/L , 就会影响鱼类的生活。
【简答题】对单用户操作系统、分时系统和实时系统它们处理连续媒体的最大问题分别是什么?
【单选题】对某些含有较多有机物的地面水及大多数工业废水,需要稀释后再培养测定BOD 5 ,以降低其浓度和保证有充足的溶解氧。稀释的程度应使培养中所消耗的溶解氧大于 mg/L ,而剩余的溶解氧 在 1mg/L 以上,耗氧率在40—70%之间为好。
A.
2
B.
3
C.
4
D.
5
【简答题】According to the text we can imagine that ________. [A] the doctor was poor too [B] the doctor was skilled and kind [C] the doctor was skilled but cruel D,. the doctor was glad to have got the two boo...
【单选题】---- The doctor told me not to drink too much , but I can’t help myself. ---- The doctor is right . ____ you drink , ______ you will be .
A.
the less ;the healthier
B.
the more ; the healthier
C.
the less; the unhealthier
D.
the more ; the healthiest
【简答题】阅读理解. Old John went to see a doctor . The doctor looked over him and said , 'Medicine can't help you. You must have a good rest. Go to a quiet place for a month , go to bed early , drink some milk , w...
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