题目内容

The doctor asks Jack to see him three times a week for two years to cure his fears.

A. 对
B. 错

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The doctor charges Jack $200 a visit.

A. 对
B. 错

Jack is willing to pay the amount the doctor charges.

A. 对
B. 错

有以下程序#includevoid fun(int n,int p){ int f1,f2;if(n==1||n==2) p=1;else{ fun(n-1,&f1); fun(n-2,&f2);*p=f1+f2;}}main(){ int s;fun(3,&s); printf("%d\n",s);}程序的运行结果是

A. 2
B. 3
C. 4
D. 5

滚珠丝杠预紧的目的是 ( ).

A. 增加阻尼比, 提高抗振性
B. 提高运动平稳性
C. 消除轴向间隙和提高传动刚度
D. 加大摩擦力,使系统能白锁