V型质子泵
参考答案：
功能是从细胞质基质中泵出H+进入细胞器，有助于保持细胞质基质中性pH和细胞器内酸性pH值。
．______ surprised the family most was ________the girl played basketball very well．
A．That; that
B．That; what
C．What; that
D．What; what
焊缝成形缺陷有哪些？说明焊缝成形缺陷的防止措施。
