生物资产按照其持有目的分三类,其中不属于此分类的是()。
A.消耗性生物资产
B.生产性生物资产
C.公益性生物资产
D.农业性生物资产
参考答案:D
—Can he work out the maths problem?
—I think ______ hard for him to work it out.[ ]
A. it's
B. that's
C. this is
D. they're
焊工的手或身体只允许接触二次回路的带电体。()