规格8.48*0.185*29*23*60*4*R的内螺纹芯头,0.185代表什么含义,错误的是()
A.生产产品齿高0.185mm
B.芯头槽底宽0.185mm
C.芯头名义齿槽深0.185mm
D.芯头长0.185Cm
A.生产产品齿高0.185mm
B.芯头槽底宽0.185mm
C.芯头名义齿槽深0.185mm
D.芯头长0.185Cm
第3题
1 1/2 6/11 17/29 23/38 ()
A.117/191
B.122/199
C.28/45
D.31/47
第4题
环海公司是一家小型工业企业,为增值税小规模纳税人。2007年3月取得销售收入8.48万元(含增值税);购进原材料一批,支付货款2.12万元(含增值税)。已知该企业适用的增值税征收率为6%,该企业当月应缴纳的增值税税额为()万元。
A.0.31
B.0.48
C.0.25
D.0.36
第5题
One year, made 445 days long by imperial decree, brought the calendar back in step with the seasons. Then the solar year (with the value of 365 days and 6 hours) was made the basis of the calendar. The months were 30 or 31 days in length, and to take care of the 6 hours, every fourth year was made a 366-day year. Moreover, Caesar decreed the year began with the first of January, not with the vernal equinox in late March.
This calendar was named the Julian calendar, after Julius Caesar, and it continues to be the calendar of the Eastern Orthodox churches to this day.
(30)
A.Shortage of days.
B.Superstition.
C.Inability to divide the year.
D.Too many months.
第6题
On which date is the Regional Meeting?
A.April 8
B.April 14
C.April 23
D.April 29
第7题
31, 29, 23, (), 17, 13, 11
A. 227
B. 235
C. 241
D. 243
第8题
考察修理(服务)时间与计算机中需要修理或更换的元件个数的关系.现有一组修理记录数据如下:
序号 修理时间y 元件个数x | 序号 修理时间y 元件个数x |
1 23 1 2 29 2 3 49 3 4 64 4 5 74 4 6 87 5 7 96 6 | 8 97 6 9 109 7 10 119 8 11 149 9 12 145 9 13 154 10 14 166 10 |
假定修理时间服从正态分布.
(1)构造修理时间y关于修理的元件个数x的散点图,该散点图是否提示两者之间存在线性关系?
(2)给出修理时间y关于修理的元件个数x的最小二乘回归直线;
(3)作回归系数b的显著性T检验,取显著性水平为5%;
(4)给出b的置信水平为95%的置信区间
第9题
23 , 27 , 26 , 8 , 29 , 1 , 32 , ()
A . 35
B . 38
C . 0
D . -1
第11题
3, 5, 7, 9, 13, 15, 21, 23, ()
A. 29
B. 31
C. 33
D. 35