在晶闸管可逆线路中的环流有（）等。A、瞬时脉动环流 B、动态环流 C、直流平均环流
题型：多项选择题
问题：
在晶闸管可逆线路中的环流有（）等。
A、瞬时脉动环流
B、动态环流
C、直流平均环流
D、直流瞬时环流
E、交流平均环流
题型：多项选择题
短文改错（共10小题；每小题1分，满分10分）
One day two young men was walking in 76.___________
the forest while they saw a bear ahead . They 77.____________
tried run away. One of them got up into a 78.____________
tree, other was fat and could not climb up . 79.____________
But he threw himself at the foot of the tree. 80.____________
Soon the bear came nearly. It saw the fat 81.____________
man .The man held his breathe . The bear thought 82.________
____
he was died, so it went away.The man in the