限流软起动的工作特点是：输出电压从（）开始迅速增加，直到输出电流达到预先设定的电流限制。
A.30%
B.20%
C.10%
D.0
参考答案：D
. When they came to the center of the forest, the visitors found themselves ____ ___ by wildlife.
A．surrounding
B．surrounded
C．to surround
D．surround
themselves ____ ___ by wildlife.