A:one thousand, two hundred and six
B:one thousand two hundred and six
C:ten thousand, two hundred and six
D:ten thousand, two hundred, six
若X为铜,为减缓铁的腐蚀,开关K应置于____ 处;若X为锌棒,开关K置于M处,该电化学防护法称为____
细胞的结构和功能是相适应的,下列叙述中正确的是