水泵属于（）设备。
A、动力
B、机械
C、起重运输
参考答案：A
Not satisfied with his handwriting, the mother asked her son to copy the article ________ second time
A．another
B．a
C．the
D．every
阿司匹林及其制剂的含量测定通常采用哪几种方法？各有何优缺点？
