drawing
(1)抽，拉，压延
(2)牵引
(3)提取
(4)回火
(5)绘图

• nuclear-pumped gas laser
• nuclear pumping
• nuclear radiation
• nuclear reactor
• nuclear transition
• nucleation
• nucleogenesis
• nucleon
• nucleous
• nuisance analysis
• null
• null adjustment
• null cone
• null corrector
• null-indicatiing bouble-beam system
• null indicator
• nulling
• nulling optics
• nullity
• null lens
• null matrix
• null method
• null method of neasurement
• null offset
• null point