对工业区位模式产生重大影响的是( )。
A．制成品的成本
B．运费
C．遍布性原料
D．限地性原料
参考答案：D
They lived a hard life and were often made _______ for over ten hours a day.[ ]
A. work
B. to work
C. to working
D. worked
镜下诊断血尿的标准为（）
A.离心尿：0～3／HPF
B.离心尿：＞3／HPF
C.离心尿：0～5／HPF
D.离心尿：＞5／HPF
E.离心尿：1～10／HPF
