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【简答题】
焊接时戴焊接头盔的主要目的是( ) 。 A. 防止紫外线伤害眼睛 B. 看清楚焊接位置 C. 保护脸部皮肤 D. 防高温32.( C )操作时要戴耳罩。 A.焊接 B.拧螺栓C.打磨D.更换钣件
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皮皮学刷刷变学霸
举一反三
【单选题】5 bullhead rail / flat bottom rail B. A ____________________ has a foot and head that are roughly even.
A.
bullhead rail
B.
flat bottom rail
【单选题】5 bullhead rail / flat bottom rail A. A ________________________ has a wider foot and narrower head.
A.
bullhead rail /
B.
flat bottom rail
【单选题】The cost of the air fare is higher than ______.
A.
the rail fare
B.
that of the rail fare
C.
those of the rail fare
D.
which of the rail fare
【单选题】Large cities prefer light rail to 'heavy' rapid-rail systems because light rail requires less construction material.
A.
Y
B.
N
C.
NG
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