Figures issued by the government of a certain country show that in 1980 the public sector and the private sector each employed the same number of people. Between 1980 and 1984, according to the government, total employment decreased in the public sector more than it increased in the private sector.
If, according to governmental figures, the unemployment rate in this country was the same in both 1980 and 1984, which of the following statements must be true about this country

A．Fewer people were in the labor force, as counted by the government, in 1984 than in 1980.

B．The competition for the available work increased between 1980 and 1984.

C．The government’s figures for total employment increased between 1980 and 1984.

D．The number of people counted by the government as unemployed was the same in 1980 and 1984.

E．(E) In 1984 more people sought work in the private sector than in the public sector.

下述模型材料必须具备的条件说法错误的是（）

A.凝固时间适当

B.与印模材料发生化学变化

C.良好的流动性、可塑性

D.体积稳定，精确度高

E.抗压强度大，表面硬度高