毛 * * 指出人民军队的唯一宗旨是全心全意为人民服务。
参考答案：对
-Where is Sally from, Mike?
-_____________[ ]
A. I am from China
B. She is from America
C. He is from England
D. You are from Japan
酸性焊条药皮中的氧化性较强，所以不适宜焊接合金元素较多的材料。( )
