Acme Corp. purchased a new stamping machine for $100000, paid $10000 for shipping, and paid $ 5000 to have it installed in their plant. Based on an estimated salvage value of $ 25000 and an economic life of six years, the-difference between straight-line depreciation and double-declining balance depreciation in the second year of the asset’s life is closest to:（）

A．$15000.

B．$16666.

C．$10556.

混合气过稀会引起（）。

A.发动机动力下降，但适当关闭阻风门后，动力有所好转

B.发动机启动后，松抬加速踏板就熄火

C.排气管冒黑烟，有时伴有“放炮”现象

D.点火系工作正常，但发动机不能启动。