单项选择题

执行语句"x=(a=3,b=a--)"后，x,a,b的值依次为
A、3, 3, 2
B、3,2,2
C、3,2,3
D、2,3,2

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单项选择题

请问上面哪个逻辑函数为左边电路不具有的逻辑功能？请填入1（或2、3、4），填入其它文字会判错哦！！！

单项选择题

No.1
Part one Listening comprehension   PRETCO 201806 Listening Comprehension     (20 minutes)
Directions: This part is to test your listening ability. It consists of 4 sections.
Section A
Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.
Example: You are hear:
You will read: A. New York City.
B. An evening party.
C.  An air trip.
             D. The man’s job.
From the dialogue we learn that the man is to take a flight to New York. Therefore, C. An air trip is the correct answer. You should mark C. on the Answer sheet with a single line through the center.
［A］［B］［C］［D］
Now the test will begin.
1
A、 A training course.
B、A work plan
C、Computer skills
D、Business management