YL335B型自动线,哪个工作站必须设为主站?
A. 供料站
B. 加工站
C. 装配站
D. 输送站
This will __________ pressure on the trains to some extent.
A. reveal
B. recover
C. relieve
D. reassure
The claim ______ the fact that every year more and more money is being spent on arms.
A. backs down
B. backs off
C. backs up
D. backs out
Rain is expected to __________ to all parts of the country by this evening.
A. expand
B. extend
C. extent
D. expend