合同当事人约定由第三人向债权人履行债务时,如果第三人不履行债务,应向债权人承担违约责任的当事人()
A.债务人
B.第三人
C.债务人或第三人
D.债务人和第三人
参考答案:A
It is in this very village , ___Mary was born 35 years ago , ___ she will build her first school ,
inspires everyone to help her .
A.where; that ; which
B.that ; that ; that
C.that ; when ; which
D.where ; when ; that
酒精的热值是3.0×107J/kg,完全燃烧0.1kg的酒精可以放热______J.