【单选题】Most creative ideas are laughed at when they are first _____. [ ]
【单选题】The new model of the car was put into production in 2007, ______ helped to provide another 1400 jobs.
【单选题】The theory was attacked when it was first , but gradually it was accepted.
【单选题】一标准安装的渐开线外啮合标准直齿圆柱齿轮机构。已知传动比i12=1.5、中心距a=200mm、模数m=4mm、α=20°、ha*= 1。试计算该对齿轮的da1、da2
A.
d a 1 = 168mm d a 2 = 248mm
B.
d a 1 = 165mm d a 2 = 250mm
C.
d a 1 = 180mm d a 2 = 280mm
D.
d a 1 = 150mm d a 2 = 240mm
【单选题】一标准安装的渐开线外啮合标准直齿圆柱齿轮机构。已知传动比i12=1.5、中心距a=200mm、模数m=4mm、α=20°、ha*= 1。试计算该对齿轮的df1、df2
A.
d f1 = 150mm d f2 = 230mm
B.
d f1 = 158mm d f2 = 235mm
C.
d f1 = 160mm d f2 = 240mm
D.
d f1 = 155mm d f2 = 235mm
【单选题】your book, and do your work first. You may read it later.
【判断题】纵梁是在车身前部底下延伸的箱形截面梁,通常是承载式车身上最坚固的部件。()
【单选题】某地区有一个空调生产企业,由一个公司总部和三个车间组成。2008年该公司共生产空调5万台,其中售出4万台,每台平均出厂价为1500元。全年制造成本及各项费用3000万元,其中职工工资500万,原材料、能源、广告费等物质和非物质消耗2000万元,应交增值税500万。该地区统计部门在2008年度工业统计时将计算该企业的相关指标。
根据上述资料,计算并回答以下问题,在备选答项中选取正确答案。
该企业总...
【单选题】What should the woman do first?
B.
Put in the soap powder.
【单选题】一标准安装的渐开线外啮合标准直齿圆柱齿轮机构。已知传动比i12=1.5、中心距a=200mm、模数m=4mm、α=20°、ha*= 1。试计算该对齿轮的d1¢、d2¢。
A.
d 1 ¢ = 160mm d 2 ¢ = 240mm
B.
d 1 ¢ = 165mm d 2 ¢ = 245mm
C.
d 1 ¢ = 166mm d 2 ¢ = 248mm
D.
d 1 ¢ = 168mm d 2 ¢ = 250mm