Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as ()
A. low temperature hardening
B. case hardening
C. annealing
D. tempering
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E1转接线用于连接UELP单板的“INSIDE”接口和GTMU单板的“E1/T1”接口,在配置UELP单板进行E1()时,使用此线缆。
A. 稳压
B. 防雷
C. 防水
D. 告警输出
简述BOD5的测定原理,注意事项,怎样估算水样的稀释倍数?怎样应用和配置稀释水和接种水?