Whatisthefunctionofpressureswitch?
A. Startingamotor
B. Shuttingdownamotor
C. Actuatingasolenoid
D. alloftheabove
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