保险公估机构在现场勘查阶段要明确公估要求与公估依据，做到以( )为根据。
A．合理推测 B．保险标的C．委托人的意愿 D．事实
参考答案：D
Many teenagers_______ the old and they often offer their seats to the old on buses.
A．agree with
B．worry about
C．laugh at
D．care for
为延长色谱柱的使用寿命，对每种固定液都有一个（）
