管子割刀的最大割轮直径是（）。
A.25mm
B.35mm
C.45mm
D.55mm
参考答案：C
—Excuse me. Could you help me carry the heavy box?
—_______.[ ]
A. Yes, I could.
B. It doesn't matter.
C. With pleasure.
D. Don't mention it.
A．SO2的摩尔质量是64g
B．1molSO2的质量是64g/mol
C．1molSO2中所含分子数约为6.02×1023
D．常温常压下，1molSO2的体积为22.4L
