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【多选题】
手工钨极氩弧焊用焊炬的作用是 。A.
夹持钨极
B.
传导焊接电流
C.
输送氩气
D.
调节焊接电压
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【单选题】— Has ______ problem been solved? — Not yet. We're trying to think of ______ way out, but it's quite difficult to find one. [ ]
A.
a; the
B.
the; a
C.
a; a
D.
the; the
【单选题】Whenever we’re in ________, we should never lose ______ but try to think of the way out.
A.
the trouble; our hearts
B.
troubles; hearts
C.
trouble; heart
D.
the trouble; the heart
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