在焊接技术中与熔化焊无关的焊接是
A.电弧焊
B.气电焊
C.电热焊
D.激光焊
E.接触焊
参考答案:E
I had a busy and tiring weekend because ______ the house for the Christmas cost me a whole day.
A.decorating
B.to decorate
C.decorated
D.decorate
压力的数学式表示为()。
A、P=f/V
B、P=F/s
C、P=s/F
D、P=F/α