具有暖泵系统的高压给水泵试运行前要进行暖泵,暖泵到泵体上下温差小于()。
A、20℃;
B、30℃;
C、40℃;
D、50℃。
参考答案:A
As a result of the earthquake, two-thirds of the buildings in the area _____. [ ]
A. need repairing
B. needs repairing
C. needs to be repaired
D. need to repair
利润率表明了()
A、资本家对工人的剥削关系
B、资本对雇佣劳动的剥削程度
C、剩余价值好象来自于全部预付资本
D、预付资本增殖的程度