As prices and building costs keep rising, the "do—it—yourself" (DIY) trend (趋势) in the U.S. continues to grow.
"We needed furniture(家具) for our living room," says John Ross, "and we just didn’t have enough money to buy it. So we decided to try making a few tables and chairs. "(76) John got married six months ago, and like many young people these days, they are struggling to make a home at a time when the cost of living is very high. The Rosses took a two-week course for $ 280 at a night school. Now they build all their furniture and make repairs around the house.
Jim Hatfield has three boys and iris wife died. He has a full—time job at home as well as in a shoe making factory. Last month, he received a car repair bill for ＄ 420. "I was deeply upset about it. Now I’ve finished a car repair course, I should be able to fix the car by myself."
John and Jim are not unusual people. In o
A. makes shoes in his home
B. does his extra work at night
C. does his own car and home repairs
D. keeps house and looks after his children
The data station usually means a (71) unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72) control functions.
In (73) data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74) by the primary station, interprets received commands and (75) responses to be transmitted.
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