NBDP中二重分集的时间间隔为()ms。
A. 280
B. 300
C. 400
D. 350
Which of the following devices is common to both mechanical and hydraulic governors?()
A. Direct linkage between the ball-head and fuel rack
B. A servomotor
C. A compensating device
D. Flyweight
严格控制化学成分防止速度过快,造成钢料内外温差过大。
A. 正确
B. 错误
发射光谱法用的摄谱仪与原子荧光分光光度计相同的部件是()不同是()。