采用分段退焊的目的是为了减少()。
A.变形
B.应力
C.气孔
参考答案:A
The student was_______ a gold cup for his excellent performance in the competition.
A.awarded
B.admitted
C.applied
D.advanced
有关副脾的描述,错误的是()
A.由异常脾组织构成
B.最常见于脾门附近,单或多发
C.密度或增强特征与正常脾脏相同
D.脾摘除后副脾可增生
E.副脾可发生淋巴瘤