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电子支票的优点是什么？

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乳前牙反最佳矫治年龄为（）

A. 1～2岁
B. 3～5岁
C. 6～7岁
D. 8～9岁
E. 无需矫治，待恒牙期再作矫治

临床上怎样鉴别烂喉痧与麻疹？

The (1) is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarized. The workflow enactment service is the heart of a workflow system which consists of several (2).空白（2）处填（）

A. workflow engines
B. processes
C. workflow threads
D. tasks

工作结束后，应关闭（）

A. 图像
B. X射线机电源
C. 电源
D. 以上全错