When a deferred tax liability account reverses it means that:（）

A. cash flows have been lessened by the amount of the reversal. 

B. the actual tax bill is equal to the tax expense reported in the income statement. 

C. the actual tax bill is greater than the tax expense reported in the income statement.

钢结构件焊接及消除应力后再进行机械加工，就不会产生变形了。