水锤的危害有压强升高过大而(),尾水管中负压过大而(),压强波动而()。
参考答案:水管强度不够而破裂;尾水管空蚀,水轮机运行时产生振动;机组运行稳定性和供电质量下降
Vanda’s Butcher Shop sells packages of ground turkey and ground beef. Is the price for a pound of ground turkey less than that for a pound of ground beef ?() (1)The price for a package of ground turkey is 30 percent greater than the price for a package of ground beef. (2)A package of ground turkey weighs 25 percent more than a package of ground beef.
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
()是按照当时生产和市场价格水平,将设备视为重新购置所需全部支出。
A、机械固定资产的原值
B、机械固定资产的净值
C、机械固定资产的重置价值
D、机械固定资产的残值