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【简答题】
一个厚度不计的圆柱形水桶,底面积为4×10 -2 m 2 ,一些对水平地面的压力为400N,求: (1)此时水桶对地面的压强为多大? (2)桶的侧壁上有一个小阀门A,它能承受的水的压强最大为6×10 3 Pa,当A距水面多深时,它将被水冲开? (3)现在,已知小阀门A距水面0.5m(如图),把一个体积为5×10 -3 m 3 的实心浮球放入水中,刚好能够把A冲开,则浮球的密度为多少?
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举一反三
【单选题】有以下结构体说明、变量定义和赋值语句: 则以下scanf函数调用语句有错误的是( )。
A.
scanf(”%s”,s[0].name);
B.
scanf(”%d”,&s[0].age);
C.
scanf(”%c”,&(ps一>sex));
D.
scanf(”%d”,ps一>age):
【单选题】What does the author want to tell us in Para. 4 to Para. 9?
A.
New technology used in public transportation.
B.
The future trends in public transportation.
C.
The automation through new technology.
D.
Advanced transit concepts.
【单选题】有以下结构体说明、变量定义和赋值语句
A.
A
B.
B
C.
C
D.
D
【单选题】What does the word 'they'(Para. 3, Line 2) refer to?
A.
questions (Para. 3, Line 1)
B.
answers (Para. 3, Line 1)
C.
reporters (Para. 3, Line 1)
D.
investigators (Para. 4, Line 1)
【单选题】Why does the author mention the 'mother' (Para. 1) and 'father' (Para. 1)?
A.
To point out that parents can teach their children statistics.
B.
To present the background of statistics in a humorous and understandable way.
C.
To introduce inferential statistics.
D.
To explain that there are different kinds of variables.
【单选题】有以下结构体说明、变量定义和赋值语句 struct STD { char name[10] int age char sex }s[5],*ps ps=&s[0] 则以下scanf函数调用语句中错误引用结构体变量成员的是______。
A.
scanf('%s',s[0].name)
B.
scanf('%d',&s[0].age)
C.
scanf('%c',&(ps->sex))
D.
scanf('%d',ps->age)
【简答题】有以下结构体说明、变量定义和赋值语句 struct STD { char name[10] int age char } s[5],*ps ps=&s[0] 则以下 scanf 函数调用语句中错误引用结构体变量成员的是 A)scanf('%s',s[0].name) B)scanf('%d',&s[0].age) C)scanf('%c',&(ps->)) D)scanf('%d',...
【单选题】Which word can take place of 'surreal' (Line 1, Para. 3 Line 5, Para. 4) in the passage?
A.
Unbelievable.
B.
Unforgettable.
C.
Authentic.
D.
Miserable.
【单选题】有以下结构体说明、变量定义和赋值语句structSTD{charname[10];intage;charsex;}s[5],*ps;ps=&s[0];则以下scanf函数调用语句有错误的是
A.
scanf''%d't,&s[0].age);
B.
scanf''%c'',&(ps->sex));
C.
scanff''%s'',s[0].name);
D.
scanff''%dtt,ps->age);
【单选题】The word 'diversity' (Para. 1 and Para. 6) most probably means______.
A.
background
B.
influence
C.
variety
D.
significance
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