电力系统暂态稳定分析用的逐步积分法是（）。
A.时域仿真法
B.直接法
C.频域法
D.暂态能量函数法
参考答案：A
________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
A．Even if
B．As far as
C．If only
D．So long as
热轧带肋钢筋最大力总伸长率不小于（）%。
A、7
B、6
C、8
D、9
