电感性负载并联一个适当电容器后,可使线路的总电流减小。
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Generally,the first action in extinguishing an LFG fire caused by escaping gas is to().
A. sweep flames away with water spray
B. shut off the leak
C. use a chemical foam fire extinguisher
D. call the local fire department
2岁患儿,伸舌时舌尖出现切迹,但对语言进食无明显影响,此时应()
A. 观察,局部不做处理
B. 局部按摩
C. 行舌系带延长术
D. 行牙槽突修整术
E. 行上颌结节修整术