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【判断题】
当焊接电缆及焊钳绝缘破坏时,更容易发生触电事故。( )(1分) 2.在大电流焊接时,增大锥角可避免尖端过热熔化,减少损耗,并防止电弧往上扩展而影响阴极斑点的稳定性。( )(1分)A.
正确
B.
错误
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【单选题】£ Here are some time markers often used with the past simple (PS) or the present perfect (PP). Choose PS or PP for the following words. Some can be used with both. already
A.
past simple (PS)
B.
present perfect (PP)
C.
both
【单选题】£ Here are some time markers often used with the past simple (PS) or the present perfect (PP). Choose PS or PP for the following words. Some can be used with both. never
A.
past simple (PS)
B.
present perfect (PP)
C.
both
【单选题】£ Here are some time markers often used with the past simple (PS) or the present perfect (PP). Choose PS or PP for the following words. Some can be used with both. in 2007
A.
past simple (PS)
B.
present perfect (PP)
C.
both
【单选题】£ Here are some time markers often used with the past simple (PS) or the present perfect (PP). Choose PS or PP for the following words. Some can be used with both. just
A.
past simple (PS)
B.
present perfect (PP)
C.
both
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