单项选择题第一台电子计算机所使用的逻辑部件一定是由()组成的。
单项选择题which type of cells can divide for the most number of times until division stops? ( ) A、human old-aged fibroblasts B、human middle-aged fibroblasts C、human embryonic fibroblasts D、cell derived from mice E、cell derived from sea turtles