俯视图是从零件的上方向六个投影面中的()投影得到的视图。
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人的身心发展包括两个方面:一是()的发展;二是()的发展。
A circuit breaker differs from a fuse in that a circuit breaker ().
A. melts and must be replaced
B. is enclosed in a tube of insulating material with metal ferrules at each end
C. gives no visual indication of having opened the circuit
D. trips to break the circuit and may be reset
既是确定编制的依据,又是控制编制的重要手段的是()
A. 财政收入
B. 财政预算
C. 财务权力