—Thank you for your coffee and tasty snacks. I'm afraid I have to go now.

—OK. _____.[ ]

A. Go slowly

B. All right

C. Sounds great

D. See you

下列说法或表示方法正确的是：

A．由C（石墨）= C（金刚石）△H =" +1.90" kJ?mol^-1可知金刚石比石墨稳定

B．在稀溶液中，H⁺（aq）+ OH^—（aq）= H₂O（l）△H ="-57.3" kJ·mol^-1，若将含0.5 mol H₂SO₄的浓硫酸与含1 mol NaOH的溶液混合，放出的热大于57.3 kJ

C．甲烷的标准燃烧热为△H =-890kJ·mol^-1，则甲烷燃烧的热化学方程式可表示为：

CH₄（g）+2O₂（g）=CO₂（g）+2H₂O（g）△H =" -890" kJ?mol^-1

D．已知：H₂（g)+F₂(g) = 2HF(g)；△H=" -270" kJ?mol^-1，则1 mol氢气与1 mol氟气反应生成2 mol液态氟化氢放出的热量小于270 kJ