【单选题】PLC也并非十全十美,下列选项中对PLC缺点描述错误的是:( )。
B.
工作速度较计算机慢,输出对输入的响应有滞后现象
C.
使用中、高档PLC,要求使用者具有相当的计算机知识
【单选题】程序段G94 X35 Z-6 R3 F0.2是循环车削的程序段
【单选题】程序段G94 X35 Z-6 R3 F0.2,是循环切削( )的程序段
【单选题】程序段G94 X35 Z-6 R3 F0.2;是循环车削( )的程序段。
【单选题】In London an investor can buy a U.S. dollar for £0.6102. In New York the £/$ exchange rate is the same as found in London. Given this information, what is the $/£ exchange rate in New York?
【单选题】S everal skeletons of another early whale, Basilosaurus, were found in sediments left by the Tethys Sea and now exposed in the Sahara desert. The word “exposed” in the passage is closest in meaning to...
【单选题】程序段G94 X35 Z-6 R3 F0.2;是循环车削( )的程序段。