直流焊接电源包括()等。
A、弧焊变压器
B、弧焊发电机
C、弧焊整流器
D、弧焊逆变器
参考答案:B, C, D
符合血友病A遗传规律的是()
A.女性为遗传者
B.男女均可发病
C.女性发病
D.男女均为遗传者
E.男性发病
--- Come on, everyone! We must be the first to complete the poster for the charity show.
---Sure.____________.
A.East or west, home is the best
B.The early bird catches the worm
C.Many hands make light work
D.Don’t put all your eggs in one basket