( )是指咨询单位在其业务领域的某环节或整体过程中的强项和领先地位。
A．加强研发创新
B．领导能力
C．核心能力
D．核心地位
参考答案：C
如图所示弹簧秤及细绳重力不计，砝码G重100牛顿，静止时弹簧秤所受的合力为（ ）
A．200牛顿
B．100牛顿
C．0
D．条件不足，无法确定
____ she is not so cheerful _____ she used to be?[ ]
A. How is it that; as
B. Why is it that; what
C. Is it why; that
D. How it is that; as
