2. The birds singing in the tee. The butterflies dancing in the flowers.
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3. There are five dogs and six cats playing in the garden.
A. 对
B. 错
4. Go straight down this road and you will not miss the bank.
A. 对
B. 错
5. No worry about your failure. Success next time.
A. 对
B. 错
电焊条药皮的主要作用之一是( )
A. 防止生锈
B. 稳定焊接电弧
C. 增大焊接电流
D. 降低焊接温度
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