I _______ play the guitar. It's too difficult(难的).[ ]
A. can
B. can't
C. don't
答案:B
判断下列化学式或名称的书写是否正确,正确的打(∨),对不正确的加以改正:
(1)氢氧化钠 Na(OH)2 (2)硫酸铵 NH4SO4 (3)氧化碳 CO ________
分出去的公司,怎样办理登记手续?