block level
闭塞电平
封锁电平
阻隔位准
闭锁位准
平放水准器
框式水准器
气泡水准仪
阻滞平面
2 atrioventricular block and complete atrioventricular block
Block 36 and Block 38 in Oman
Block Xia 502 and Block Xia 509
coupling mechanism between upper level and low level jet
fiscal system at county level and township level
interaction between upper level and lower level
municipal level and county level
2~n valued functional flip-flop
3D functional structure cell library
a functional land classification system
above-ground biomass of functional group
Absorptive functional fiber
Abstract functional differential equations
acceptance functional test
accountancy functional constituency
acidic functional group