过高的增加锰含量,会恶化()。
A.钢的耐磨性
B.钢的焊接能力
C.钢的热加工性能
D.钢的腐蚀性
参考答案:C
.
Don’t you think ti is unfair for about two thirds of the population to have no_____ to health care?
A.access
B.basis
C.entrance
D.guarantee
运行中的水泵增开出口阀门时,流量扬程都随之增大。