CRH2型动车组每个单元采用()半导体冷却装置逆变器。
A.4台
B.3台
C.2台
D.1台
参考答案:B
—Were you frightened by the bull?
—__________. I was scared out of skin!
A.You bet
B.No problem
C.Don’t mention it
D.That’s right
煤气热值的国际单位为()。