我国目前实施的儿童基础免疫程序包括下列哪种疫苗（） A.脊髓灰质炎活疫苗 B.百白破

直流电机的结构有什么特点？

Andrew, Ben and Cynthia are partners who own a bakery. Andrew’s contribution to the partnership is his labour and his skills to decorate wedding cakes. Ben contributed a sum of money, whilst Cynthia works full-time in the bakery as a manager. The partnership made a small profi t last year but the partners are unable to agree on how to distribute it.Required:Advise the partners on the validity of the agreement and the distribution of profi ts. (10 marks)

《兵役法》第二条规定：“中华人民共和国实行（）相结合、民兵与预备役相结合的兵役制度。

A.义务兵与民兵

B.义务兵与武装警察

C.义务兵与预备役

D.义务兵与志愿兵

齿轮零件的剖视图不便于标注花键的键宽和小径尺寸。

异响的确定是（）异响。

A.指从众多

B.找准原因

C.声响中

D.分辨出