A female staff member helps an elderly businessman to carry his heavy luggage back to his hotel. The businessman said, "Thank you very much." If you were the staff, how would you respond to his thanks?
A.
It's my duty to do so.
B.
My pleasure.
C.
That's nothing.
D.
无
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【简答题】某 反应 20 °C 及 30 °C 时反应速率常数分别为 1.3 × 10 -5 mol -1 · L·s -1 及 3.5 × 10 -5 mol -1 ·L·S -1 , 根据 Vant Hoff 规则 , 计算 50 °C 时的反应速率常数。