社会主义国家公安机关与剥削阶级国家警察机关在同人民群众的关系上是不同的．( )
参考答案：对
A good friend of mine from _________- I was born showed up at my home right before I left for Beijing.
A．how
B．whom
C．when
D．which
TY-220型推煤机燃油箱容量（）升。
A.450
B.400
C.500
