15MnVR钢焊条电弧焊时,可选用焊条E5016(J506)。
参考答案:对
按要求写句子。
1. This is a box and that is a knife. (改为复数句)
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2. Please put the clothes here. (改为否定句)
3. They get up at six thirty. (对画线部分提问)
4. Mary's birthday is on November thirteenth. (对画线部分提问)
5. can, buses, many, there, I, over, see (.) (连词成句)
正中颌位是指()
A.韧带位
B.下颌后退位
C.牙尖交错位
D.直立姿势位