计算圆锥体积的字母公式是______．
圆锥的体积公式用字母表示：V=13Sh．
故答案为：V=13Sh．
Would you like to ______ us? We are going to _____ the school’s 20th anniversary celebration.
A．join in; take part in
B．join in; join
C．take part in; join
D．join; take part in
及时填制或取得原始凭证，是会计核算工作得以正常进行的( )。
A．主要来源B．前提条件C．必要措施D．重要原因
