搜题请搜索小程序“爱下问搜题”
问题 单项选择题

复锥牙轮产生滑动的原因是复锥牙轮绕轴线转动时线速度呈（）分布。

A、直线

B、折线

C、曲线

D、等值

答案

参考答案：B

补全对话，情景问答
下面是Tim和Mary的对话，请从方框中选择恰当的句子补全对话
M: Hello, Tim．How are you?
T:  1__       What about you, Mary?
M: I'm OK, thanks．Do you like some tea?
T:  2__       Do you have any orange juice(果汁)?
M: Of course．4__      
T:  Thanks very much．Is this the photo of your family?
M:  5__      
T:   And is the boy with a basketball your brother?
M:  6__      
A．Let me get you some orange juice．
B．I'm fine, thank you．
C．Yes, he likes basketball very much．
D．No, thanks．
E．Yes, it is．
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单项选择题

有以下程序：
#include ＜iostream＞
using namespace std;
class R

public:
R(int f1,int r2)

R1=r1;
R2=r2;

void print();
void print ()const;
private:
int R1, R2;
;
void R: :print()

cout＜＜R1＜＜", "＜＜R2＜＜end1;

void R: :print() const

cout＜＜Rl＜＜", "＜＜R2＜＜end1;

int main ()

R a(5,4);
const R b(20,52);
b.print ();
return 0;

执行后的输出结果是

A．5,4

B．20,52

C．0,0

D．4,5
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