添加变桨变频器AC2内部地到（）模块.
A.BC3150
B.BK3150
C.KL500
1D.KL4001
参考答案：D
—May I speak to Mr. Green?
—Sorry, he _____ to Beijing. He hasn't been back yet. [ ]
A. goes
B. has been
C. has gone
骨折皮肤牵引重量一般不超过5Kg。()
