A:细胞膜的基本骨架是②
B:细胞膜的功能复杂程度主要与①有关
C:②是静止的,但①是运动的,所以细胞膜具有流动性
D:脂溶性物质可通过细胞膜是因为②
25+25+25= ____ × ____ = ____
镁原子和氯原子的结构示意图如图所示.
Modern medicine ____ (develop) so quickly recently that many diseases can he cured.