多项选择题

下列选项中属于水力侵蚀防治农业措施的有。
A、等高耕作
B、沟坑田垄耕作
C、等高间作套种
D、留茬保秸

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单项选择题

吸尘是清洁保养地毯最基本、最方便的方法。（） A. 对 B. 错

单项选择题

The original value of a fixed asset is 250 000 yuan, and the estimated net salvage value is 6 000 yuan. It is estimated that the fixed asset can be used for 8 years. According to the double -declining -balance method , the depreciation that should be extracted in the second year is
A、46 875 yuan
B、45 750 yuan
C、61 000 yuan
D、30 500 yuan