使用游标卡尺测量工件前,需检查游标卡尺各部件的相互作用。( )
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Photoshop中“背景层”始终在最上层。
A. 对
B. 错
CMYK模式中共有()个单独的颜色通道。
A. 1
B. 2
C. 3
D. 4
Each key on the board is ________ a different type of function.
A. with
B. as
C. for
D. to
When he was in danger, nobody came to his ________.
A. help
B. assistance
C. assist
D. rescue