120：130=3：2．
即两人效率比是：3：2．
故选：C．
Paul is good, hard-working and intelligent; ，I can't speak too highly of him. [ ]
A. as a result
B. in a word
C. by the way
D.on the contrary
锁骨上神经阻滞是阻滞了臂丛神经的哪一部分
A．根B．干C．股D．束E．支
