热水系统压力（）.
A、2-2.5巴
B、0、5-1巴
C、2、5-3巴
D、3巴以上
参考答案：A
Located ________ the eastern coast of the sea, the village is fairly new ________ only a small population of less than 3,000.
A．on, with
B．off, with
C．in, of
D．on, in
空胶囊中加入苯甲酸是作为( )
A．遮光剂B．增塑剂C．矫味剂D．防腐剂E．增加胶冻力
