∠1与63°角组成一个直角，∠1=______．
∠1=90°-63°=27°．
答：∠1=27°．
故答案为：27°．
----Who’s the boy?
---- He is Jim and _____ my friend.
A．his
B．he’s
C．she’s
D．you’re
住宅用户，由变压器低压侧至线路末端，电压损失应小于5%。( )
