题干
Don't wait for people to be friendly, show them a friendly person you are.
A：what
B：how
C：when
D：where
答案(点此获取答案解析）
A
Don't wait for people to be friendly, show them a friendly person you are.
A：what
B：how
C：when
D：where
2SO3，下列叙述能够说明反应已经达到平衡状态的是（ ）
