铝及铝合金管的焊接可采用的方法有( )。
A.手工钨极氩弧焊
B.氧-乙炔焊
C.熔化极半自动氩弧焊
D.电阻焊
参考答案:A,B,C
It is reported that a 3 percent was the government’s aim.
A.economic grow
B.economy growth
C.economical growth
D.economic growth
只要犯罪嫌疑人在取保候审期间擅自外出或毁灭、伪造证据的,一律没收其全部保证金。