She took someone else's book in mistake for __________.
A. its own
B. her own
C. its owe
D. her owe
入户线在进墙的一段应采用额定电压不低于()V的绝缘导线。
A. 220
B. 380
C. 500
D. 1000
刚性塑料导管(槽)布线,沿建筑物表面或支架上敷设,宜在直线段每隔()米设伸缩接头。
A. 10
B. 30
C. 60
D. 100
穿管导线和槽板配线中间不允许有接头,必须接头时,应把接头放在、或灯头盒内。