流体的运动粘度不象动力粘度可直接表示流体粘性的大小，只有（）相近的流体，才可用来大致比较它们的粘性。
A.温度
B.密度
C.压力
D.质量
参考答案：B
Sam got wounded in the Vietnam War and he still has a hole ______ in his leg.
A．half the size of a coin
B．a size half of a coin
C．half the size as much as a coin
D．as much as half coin
进出口化妆品的经营者或其代理人应在报检前( )个工作日向国家质检总局指定的检验机构提出标签审核申请。
A．30
B．60
C．90
D．120
