零件在工序间的各种移动方式中，加工周期最短的是（）
A.顺序移动方式
B.平行移动方式
C.平行顺序移动方式
D.整批移动
参考答案：B
Dina,____ for months to find a job as a waitress, finally took a position at a local advertising agency. [ ]
A. struggling
B. struggled
C. having struggled
D. to struggle
乳剂的靶向性特点在于其对下列哪项有亲和性
A．肝脏
B．脾脏
C．骨髓
D．肺
E．淋巴系统
