力企业市场营销的中心是实现电能的(),最终完成电能使用价值,并获得()。
参考答案:交换;利润
在400m的椭圆形跑道中进行400米赛跑,如果道宽为1.5m,起跑线该依次提前多少米?
Calculator is (66) for performing arithmetic operations, but that requires human intervention to alter its stored program, if any, and to initiate each operation or sequence of operations. A calculator performs some of the functions of a computer, but usually operates only with frequent human intervention.
Microcomputer’s processing unit consists of one or more microprocessors, and includes storage and input-output (67) . Personal computer primarily intended for (68) use by an individual. (69) computer can be hand-carried for use in more than one location. Minicomputer is functionally intermediate between a microcomputer and a mainframe. And supercomputer has the highest processing speeds available at a given time for (70) scientific and engineering problems.
(67)处填()。
A.devices
B.equipment
C.units
D.facilities