SS8型电力机车磁场削弱为晶闸管分路无级削弱。()
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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
三相异步电动机运行时，若转差率为零则电磁转矩也为零。()
烧伤后形成的焦痂进入组织溶解期的时间是伤后()
A. 一周
B. 3～5 d
C. 7～10 d
D. 2～3周
E. 4周
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