电空接触器一般使用在SS3型电力机车的（）。

SS3型电力机车主电路接地采用了（）套接地保护系统。

A、一
B、二
C、三
D、四

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To which of the following items does IAS 41 Agriculture apply?(i) A change in the fair value of a herd of farm animals relating to the unit price of the animals(ii) Logs held in a wood yard(iii) Farm land which is used for growing vegetables(iv) The cost of developing a new type of crop seed which is resistant to tropical diseasesA.All fourB.(i) onlyC.(i) and (ii) onlyD.(ii) and (iii) only

A.All
B.(i)
C.(i)
D.(ii)

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