在MCS-51单片机中,当晶振频率采用2MHZ时,一个机器周期等于()微秒.
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A marine chemist issues gas free certificates and is certified by which organization? ()
A. Mine Safety Appliance Association
B. American Chemical Society
C. Marine Chemists Association
D. National Fire Protection Associatio
差速器安装在轮式拖拉机的()中,它的功用是:把中央传动()齿轮传来的动力分配给两侧(),并且能使两侧驱动轮()驱动,以保证拖拉机顺利()。