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【简答题】
Fill in the blank in each sentence with a word taken from the box in its appropriate form. await delay dread confront facade premise feverishly automatically 1. Scientists in California believe they may have discovered a way to _____ the aging process. 2. _____ he s et to work, and by the end of the day he had composed the whole concerto. 3. Although they put up a _____ of honesty, I knew that they were involved in various criminal activities. 4. On my first day a t work I was _____ with the task of chairing a meeting . 5. British and American justice works on the _____ that an accused person is innocent until he's proved guilty. 6. He alw ays _____ asking them for their rent money because he knew it would end in an argument. 7. At first you may find it d i ffi c ult to follow the procedure, but soon you'll be doing it _____. 8. The committee is _____ a decision from the head office before it takes any action.
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【单选题】多线螺纹的导程和螺距的关系可用下式表示()。
A.
L=πmx
B.
L=nP
C.
L=qmx
D.
L=(1/2)mP
【单选题】在一条通信线路中可以同时双向传输数据的方式是( )
A.
半工通信
B.
半双工通信
C.
同步通信
D.
双工通信
【简答题】MCS-51单片机的P0与____________ 端口除了可以进行数据的输入与输出外,通常还用来构建系统的__________ ?
【单选题】在一条通信线路中可以同时双向传输数据的方法是( )。
A.
单工传输
B.
半双工传输
C.
同步传输
D.
全双工传输
【单选题】()是指在一条通信线路中可以同时双向传输数据的方法。
A.
单工传输
B.
半双工传输
C.
同步传输
D.
全双工传输
【单选题】在一条通信线路中可以同时双向传输数据的方式称为()
A.
全双工通信
B.
单工通信
C.
频带传输
D.
基带传输
【单选题】三线电缆中的红色线是()
A.
零线
B.
火线
C.
地线
【简答题】MCS-51单片机的定时/计数器T0做作计数器,处于工作方式2,计数初值为252,则TF0与P3.4的关系为()。
【单选题】( )是指在一条通信线路中可以同时双向传输数据的方法
A.
单工传输
B.
半双工传输
C.
同步传输
D.
双工传输
【单选题】使用MCS-51单片机的P0口,直接与按键相连,最多能扩展按键的数量是()。
A.
8个
B.
10个
C.
16个
D.
20个
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