当x=1时，原式=13×1-2=1．
故答案为1．
丙酮酸氧化脱羧的酶系存在于细胞的什么部位
A．细胞液
B．线粒体
C．溶酶体
D．微粒体
The jeans are too long. Would you mind give me___ ?[ ]
A. the shorter pair
B. a shorter pair
C. a short pair
D. the shorter ones
