After fitting back in place the gear wheels, dont forget () them.
A. to grease
B. greasing
C. oiling
D. lubricating
After ensuring that the () is correct the bearing clearance should be checked.
A. nap
B. gap
C. nip
D. deflectio
半导体色敏传感器可用来直接测量从可见光到红外波段内的单设辐射的波长。
A. 正确
B. 错误
在腌制卷心菜的时候,为什么前期采取低温发酵而后期则适当提高发酵温度。