胸椎片发现椎体均匀性压扁成片状，应怀疑（）
A.脊柱结核
B.强直性脊柱炎
C.椎间盘突出
D.椎管狭窄症
E.嗜酸性肉芽肿
参考答案：E
分步法的成本计算对象是产品生产批别。
Before the economic crisis came, John had sensed that the firm was to be ruined and he
just in time.
A．pulled up
B．pulled out
C．pulled off
D．pulled down
