【单选题】The blood flow may be increased by more rapid and vigorous heart action.
【单选题】The blood flow may be increased by more rapid and vigorous heart action.
【简答题】汽车驱动力的最大值固然取决于____________和____________,而实际上驱动力还要受到____________。
【简答题】酵母菌的有性生殖过程可以分为 __________ , __________ 和 __________ 三个阶段。