【简答题】MCS-51单片机共有40个引脚,其中四个专用的控制信号引脚是:(____)、(____ )、(____ )、(____)。
【单选题】Anne Sullivan could not teach Helen Keller to speak until some other important things had been learned. The little girl had to learn to control her actions and feelings. She had to learn that she coul...
【判断题】热辐射的能力与温度有关,随着温度的升高,热辐射的作用将变得越加重要;高温时,热辐射将起决定作用。
【单选题】Because Helen Keller could neither see nor hear, Anne Sullivan based her instructionon a system of communication through touch.
【单选题】Which of the following statements is INCORRECT?
A.
Anne Sullivan helped her get ready for school and college.
B.
Helen Keller was 13 years old when she started at Radcliffe College in Massachusetts.
C.
Helen Keller worked for many years for the American Foundation for the Blind.
D.
Helen Keller died in nineteen sixty-eight.
【判断题】When oligopolists collude and form a cartel, the outcome in the market is similar to that generated by a perfectly competitive market.
【单选题】Helen ______ with the help of her teacher Anne Sullivan.
【单选题】When oligopolists join together in a cartel, they:
A.
choose to ignore their mutual interdependence.
B.
indicate awareness that their behavior is interdependent.
C.
violate the law of supply and demand.
D.
attempt to behave like perfect competitors.
【单选题】Anne Sullivan spelled the words ________ Helen's hand. [ ]