下列电极中,电极电位被认为恒为零的电极是( )电极。
A. 标准氢
B. 标准甘汞
C. 标准银
D. 惰性
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简述企业价值评估与与构成企业的各个单项资产的评估值简单加和的区别?
好的项目产出的前提是好的工作质量。
A. 正确
B. 错误
Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? ()
A. Viscosity is decreased
B. Octane number is altered
C. Pump speed is decreased
D. Blower’s speed is decreased
离心泵在启动时应先将出口阀(),目的是()。容积式泵在启动时,其出口阀必须().