Whatisthefunctionofpressureswitch?
A. Startingamotor
B. Shuttingdownamotor
C. Actuatingasolenoid
D. alloftheabove
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阴阳学说的核心内容包括（）。
A. 对立制约
B. 互根互用
C. 消长平衡
D. 相互转化
在自然界，秋季到冬季气温由凉爽转入寒冷，呈现阴气主下降的趋势。（）
A. 对
B. 错
2D scanners were much cheaper than 1D scanners when were introduced.
A. 对
B. 错
1D scanning technology should be replaced by 2D barcode technology.
A. 对
B. 错
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