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【单选题】
Mrs. Adams' grandfather lived with her and her husband. Every morning he went for a walk in the park and came home at half past twelve for his lunch. But one morning a police car stopped outside Mrs. Adams' [louse at twelve o'clock, and two policemen helped her grandfather get out. “The poor old gentleman lost his way in the park and called us for help, so we sent a car to bring him home.' Mrs. Adams was very surprised, but she thanked the policemen and they left. 'But, grandfather,' she then said, 'you've been to the park nearly every day for twenty years. How did you lose your way there'?' The old man smiled and said, “I didn't lose my way. I just got tired and I didn't want to walk home!' Mrs. Adams' grandfather got home at half past twelve that day.
A.
True.
B.
False.
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参考答案:
举一反三
【简答题】已知随机变量X N(μ, ),且P(X≥2)=0.5,P(X≥5)=Φ(-1),则μ= ‍ ‍ , = 。 ‍ ‍
【单选题】叶片泵分为单作用式叶片泵与双作用式叶片泵。单作用式叶片泵的定子曲线是( )形 ,双作用式叶片泵的定子曲线是椭圆形。
A.
方形
B.
不规则
C.
圆形
D.
三角形
【单选题】双作用叶片泵的定子曲线是___
A.
圆形
B.
椭圆形
C.
四段圆弧和四段过渡曲线
D.
以上都不对
【单选题】质点沿x‍轴正向运动,其加速度随位置的变化关系为:a=1/3+3x2,如在x=0处的速度v0=5m/s,那么,x=3m处的速度为‍
A.
9m/s
B.
8m/s
C.
7.8m/s
D.
7.2m/s
【单选题】已知f(x)=5,g(x1,x2,x3)=x1+x2+x3,其中x,x1,x2,x3‍均为自然数,新函数h可递归的构造如下:h(0,x) = f(x), 且h(S(n), x) = g(h(n,x),n,x),其中S(n)为后继函数,请按递归式进行计算下列式子,正确的是_____。
A.
h(1 , x) = 5
B.
h(2 , x) = 5+x
C.
h(3 , x) = 5+2x
D.
h(4 , x) = 5+3x
【简答题】用二分法求方程1.003-x=0在区间[-10,6]内的一个实根,完成下表: 0 -10 6 -2 8 + 1 1 2 3 4 ‍ 5 2 6 7 8 9 10
【多选题】双作用叶片泵的定子内表面是由哪些曲线组成?
A.
两端长半径圆弧
B.
两段短半径圆弧
C.
四段过渡曲线
D.
四段等半径圆弧
【单选题】下图为某生物的处于不同分裂时期的细胞示意图,相关叙述正确的是
A.
甲、乙、丙中都有同源染色体
B.
卵巢中不可能同时出现这三种细胞
C.
能够出现基因重组的是乙
D.
丙的子细胞是精细胞
【简答题】2 ‍ / 5 x = ( ) ‍ / 5 a x
【简答题】双作用叶片泵的定子内表面工作曲线是由 、 、 组成的。
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