Suppose: draw heart and receive $12; draw spade, diamond or club and lose $4; probability of drawing heart = 13/52 = ¼; probability of drawing spade, diamond or club = 39/52 = ¾, then the expected value is:
A: -1
B: -2
C: 0
D: 1
A: -1
B: -2
C: 0
D: 1
C
举一反三
- 关于枚举类型变量声明错误的选项是哪一个？ A: enum _card_t { SPADE, HEART, DIAMOND, CLUB} card_type; B: enum _card_t { SPADE=1, HEART, DIAMOND, CLUB}; enum _card_t card_type; C: typedef enum _card_t { SPADE, HEART, DIAMOND, CLUB} card_t; _card_t card_type; D: enum { SPADE, HEART, DIAMOND, CLUB} card_type;
- A set of poker cards consists of four signs: heart, spade, club, and _________. A: ox B: diamond C: square D: mete
- 如下程序段，在划线处填写语句并写出card变量的值。 enum { club，diamond，heart，spade } card; card=heart; printf ( “___________ \n”,card);
- The man was often seen _________ by the lake. A: to draw B: to drawing C: draw
- The boy ____(draw) a picture now. A: is drawing B: are drawing C: draws D: drew
内容
- 0
____________ is my hobby. A: Draw B: Draws C: Drawing
- 1
The boy____ a picture now. A: draws B: is drawing C: will draw D:
- 2
While we were listening to the teacher, I noticed Mingming ________ a picture. A: drew B: was drawing C: drawing D: to draw
- 3
While we were listening to the teacher, I noticed Mingming ________ a picture. A: drew B: was drawing C: drawing D: to draw
- 4
To draw a mind map, you have to be good at drawing pictures. ( )