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【单选题】
肿瘤生长分数是指A.
肿瘤细胞群体中处于增殖阶段(S+G2期)的细胞的比例
B.
肿瘤细胞群体中处于合成前期(G1期)的细胞的比例
C.
肿瘤细胞群体中处于有丝分裂期(M期)的细胞的比例
D.
肿瘤细胞群体中处于合成前、后期(G1+ G2期)的细胞的比例
E.
肿瘤细胞群体中处于合成期(S期)的细胞的比例
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【简答题】From the refined oil we obtain important products, such as ______ , kerosene, detergents,______ ,______ , and perfumes.
【单选题】We can learn from the last paragraph that ______.
A.
it is necessary to obtain as much knowledge as possible
B.
people should make the best use of the information accessible
C.
we should realize the importance of accumulating information
D.
it is of vital importance to acquire needed information efficiently
【单选题】We can learn from the last paragraph that .
A.
it is necessary to obtain as much information as possible
B.
people should make the best use of the information
C.
we should realize the importance of accumulating information
D.
it is of vital importance to acquire needed information efficiently
【单选题】国防法规规定的 公民的国防义务有:( )的义务、接受国防教育的义务、保护国防设施的义务、( )的义务、支持国防建设协助军事活动的义务。
A.
参加战争、守卫家园
B.
抵御外敌、保家卫国
C.
服兵役、 保守国防秘密
D.
参与国家建设、提出参政建议
【简答题】我国公民的国防义务有哪些？
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