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【多选题】
三极管工作在截止状态时具有以下哪些特点?( )A.
三极管的 发射结和集电结均反向偏置。
B.
若不计穿透电流 I CEO , I B 、 I C 近似为 0 。
C.
三极管的集电极和发射极之间电阻很大，相当于一个开关断开。
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【简答题】下面程序段的运行结果是()。 DO 1 I=1,10,2 1K=K+1 PRINT *,K END (A) 10 (B) 8 (C) 6 (D) 5
【判断题】下列输出语句中正确的是 。A) print*, (a(k,j),k=1,3,j=1,3)B) print*, a(k,j),k=1,3,j=1,3)C) print*, ((a(k,j),k=1,3),j=1,3)D) print*, (a(k,j),k=1,3),j=1,3A. 写法不正确B. 写法不正确C. 正确D. 写法不正确
A.
正确
B.
错误
【单选题】下述循环的循环次数是: k=2; while(k): print( “%d”,k); k-=1; print(“\n”);
A.
无限次
B.
0 次
C.
1 次
D.
2 次
【单选题】下列Visual Basic程序段运行时输出的结果是( ) For k=1 to 3 If k<=1 Then a=3 If k<=2 Then a=2 If k<=3 Then a=1 Print a; Next Print k
A.
1 1 1 4
B.
3 2 1 4
C.
3 3 3 3
D.
1 2 3 4
【单选题】Why does Anna want to improve English?
A.
To get a promotion soon.
B.
To communicate with her customers better.
C.
To make friends with British people.
D.
To make use of her spare time.
【单选题】下列程序段的执行结果为 a=5 For k=1 To 0 a=a * k Next k Print k；a
A.
-1 6
B.
-1 16
C.
1 5
D.
11 21
【单选题】Why does Tina want to travel alone?
A.
Because she doesn't have a boyfriend
B.
Because she wants to be more independent
C.
Because she doesn't like travelling with others
【单选题】Why does John Want to buy bicycle?
A.
To replace his stolen bicycle.
B.
To begin bicycling to work.
C.
To join a bicycle club.
D.
To train for a bicycle race.
【单选题】Why does John want to buy a bicycle?
A.
To replace his stolen bicycle.
B.
To begin bicycling to work.
C.
To join a bicycle club.
D.
To train for a bicycle race.
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