单项选择题

【单选题】以下关于电场线说法正确的是

A、电场线是客观存在的,不以人的意志改变
B、电场线是为了研究问题方便而虚构的
C、电场线越密,电场越小
D、电场线越密,电势越小

你可能感兴趣的试题

单项选择题

电动势是（）做功，与所移送电荷的比值

A.静电力
B．非静电力
C．电场力
D．化学力

单项选择题

【单选题】The asset section of the January 1, 20X9, balance sheet of Big Valley Company includes a machine which was acquired on January 1, 20X5. The machine’s original cost was $500,000, and the estimated life was determined to be 10 years. The estimated residual value was zero, and the straight-line method of depreciation was chosen. The book value of the machine as of January 1, 20X9, is:
A、9%
B、14.4%
C、18%
D、35%