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电阻材料必需有较高的电阻系数，承受长时间的高温，阻值随温度的变化小。()

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The selection says that trends are toward the______.

A. growth of cities and shrinking of suburban areas
B. growth of both rural and suburban areas
C. shrinking of urban and suburban areas
D. growth of urban and suburban areas

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电阻材料必需有较高的电阻系数，承受长时间的高温，阻值随温度的变化小。()

牵引电动机单次中修时，电枢须做清洗、烘干和浸漆处理。()

直流电机的换向极绕组一般和电枢绕组并联。()

SS8型电力机车磁场削弱为晶闸管分路无级削弱。()

The selection says that trends are toward the______.