【简答题】Which of the following was NOT a constraint on one's choice of soulmate in the old days'?
【多选题】埋弧焊机的特性包括()等。
B.
埋弧自动焊是依靠颗粒状焊剂堆积形成保护条件,主要适用于平位置焊接
C.
埋弧焊剂的成分主要是MnO、SiO2等金属及非金属氧化物
【判断题】CO2气体保护焊与手弧焊相比,成本低,生产率高。与埋弧自动焊相比可以进行各种空间位置焊缝的焊接。但是C02气体保护焊一般只适于焊接低碳钢和低合金钢。
【单选题】On the day he got back the umbrellas, the woman on the bus ______.
A.
wanted to get one of them
B.
thought one of them was hers
C.
thought he had stolen (偷) them
【单选题】以下关于埋弧焊的焊接位置说法正确的是()
【简答题】Between the choice of being downloaded into a computer which is stuck in a room but still being able to think and the choice of dying, Hillis will choose the ______ one.
【简答题】Which of the following was NOT a constraint On one's choice of soulmate in the old days?
【判断题】CO 2 气体保护焊与手弧焊相比,成本低,生产率高。与埋弧自动焊相比,可以进行各种空间位置焊缝的焊接。但是 CO 2 气体保护焊一般只适于焊接低碳钢和低合金钢。