下列哪一项不能在食管上直接形成压迫
A．主动脉弓
B．肺动脉
C．气管分叉
D．左肺动脉
E．左心房
参考答案：B
下列装置可以构成原电池的是 [ ]
A.
B.
C.
D.
He went on talking while I tried to ______ what it meant.
A．come out
B．set out
C．take out
D．figure out
