Teaching in a village is good for me.
A:/; experience
B:a; experience
C:a; experiences
D:an; experience
“When____ (meet) bad people, don't be afraid.” Father told me.
下列工业区中,不属于传统工业区的是( )
木炭的热值是3.4×107J/kg,6kg木炭完全燃烧可放出 ____ 的热量.若炉中的木炭只剩下0.1kg,它的热值是____ 。