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【简答题】
何谓转移（瘤、转移瘤）?常见的肿瘤扩散方式有哪几种？
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反馈参考答案：
举一反三
【简答题】在平面直角坐标系xOy中，一次函数y＝－ x＋3的图象与x轴交于点A，与y轴交于点B，动点P从点B出发沿BA向终点A运动，同时动点Q从点O出发沿OB向点B运动，到达点B后立刻以原来的速度沿BO返回．点P，Q运动速度均为每秒1个单位长度，当点P到达点A时停止运动，点Q也同时停止．连结PQ，设运动时间为t(t>0)秒． (1)求点P的坐标（用含t的代数式表示）； (2)当点Q从点O向点B运动时(未到达...
【单选题】The difference between a permutation and a combination is
A.
a combination is based on the classical definition of probability.
B.
in a permutation order is not important and in a combination it is important.
C.
in a permutation order is important and in a combination order is not important.
D.
a permutation is based on the classical definition of probability.
【单选题】Injectors on modern engines are cooled by a combination of the intensive bore cooling in the cylinder by a combination of the intensive bore pockets and by the fuel which is re-circulated through the ...
A.
slope
B.
base
C.
top
D.
bottom
【简答题】从化学结构上看,糖类是()或(),或者()后可以生成多羟基醛或多羟基酮的化合物。
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