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【单选题】
设随机变量X的方差为2,根据切比雪夫不等式,有【图片】
A.
0.5
B.
0.2
C.
0.3
D.
0.4
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【单选题】— Why has Mr. Green been busy going to the library recently? — _____ ready for the public speech. [     ]
A.
Get
B.
To get
C.
Having got
D.
Getting
【简答题】阅读理解,判断对(T)错(F)。 Mr. Green has a dog. It loves him very much. One day Mr. Green goes out to throw away his old shoes. He puts them near the rubbish box. The dog goes there to look for food. It sees th...
【单选题】脉冲当量是指( )
A.
每发一个脉冲信号,机床相应移动部件产生的位移量
B.
每发一个脉冲信号,伺服电机转过角度
C.
进给速度大小
D.
每发一个脉冲信号,相应丝杠产生转角大小
【判断题】C 语言中 , 文件的使用方式 "wb" 用于新建一个二进制文件,然后进行写操作。
A.
正确
B.
错误
【单选题】脉冲当量是指( )
A.
进给速度大小
B.
每发一个脉冲信号,相应丝杠产生转角大小
C.
每发一个脉冲信号,机床移动部件的位移量
D.
每发一个脉冲信号,伺服电机转过的角度
【单选题】Mr. Green _______ to Beijing two weeks ago. He ______ there many times.
A.
has gone; has been
B.
went; has been
C.
has gone; went
D.
went; went
【判断题】直尺是服装制图的常用工具,它包括三角尺和角尺。
A.
正确
B.
错误
【单选题】在下列选项中,Java中的字符类型变量无论是中文,英文还是数字,都是占()字节。
A.
1
B.
8
C.
2
D.
4
【判断题】直尺是服装制图的常用工具,它包括三角尺和角尺。
A.
正确
B.
错误
【单选题】With a Cobb–Douglas production function, the share of output going to labor:
A.
decreases as the amount of labor increases.
B.
increases as the amount of labor increases.
C.
increases as the amount of capital increases.
D.
is independent of the amount of labor.
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