49. These young people were so _____________ about things in the U. S. that they thought blacks and whites had always had equal educational opportunities there. (A) innocent (B) intelligent (C) ignorant (D) confident
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12.
12.(4分)电气工作人员在10kV配电装置附近工作时,其正常活动范围与带电设备的最小安全距离是( )。 A. 0.2m; B. 0.35m C. 0.4