用电子显微镜观察,大部分细胞膜分为三层,称为单位膜。()
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上皮组织一面向着外界或腔隙,一面借基膜与结缔组织相连,故上皮细胞具有极性。()
What does the man ask the woman to do?
A. Host the party.
B. Prepare for the party.
C. Remind him of the party.
D. Go with him to the party.
有丝分裂前期的特点之一是核膜、核仁尚未发生变化,而染色体逐渐向细胞中央移动。()