VVVF电梯速度图形运算中，速度图形值为负值的是（）阶段。
A.加加速
B.匀加速
C.减速圆角
D.平层
参考答案：D
等于（）。
A．A
B．B
C．C
D．D
－All the dresses look nice. I can’t decide _____.
－I think the orange on is the best.
A．which one can I buy
B．what shall I buy
C．which one I should buy
D．whether I can buy one.
等于（）。