楼梯下要通行一般其净高度不小于()。
A、2100mm
B、1900mm
C、2000mm
D、2400mm
参考答案:C
A. The chairman asked the board to prepare an outline for the development plan. B. The chairman agreed in general with the development plan proposed by the board. C. The chairman described what the company would do in the years to come. D. The chairman decided to contend against the company’s development strategy.
什么是内过电压?