通用变频器的逆变电路中功率开关管现在一般采用（）模块。
A、晶闸管
B、MOSFET
C、GTR
D、IGBT
参考答案：D
I've got three days' holiday, New Year's Day _____ . [ ]
A. including
B. included
C. includes
D. is included
在等高线地形图上，坡陡的地方，等高线就______________，坡缓的地方，等高线就______________。
