【单选题】下列影响工程施工质量的因素中,属于施工质量管理环境因素的是( )。
【判断题】中心架和跟刀架在车削细长的轴类零件时,用作辅助支承,以提高工件的装夹刚性,防止工件在加工中弯曲变形。
【简答题】已知集合A={x| },集合B={x|mx-1=0} (1)写出集合A的所有子集(7分) (2)若B真包含于A,求实数m的的值(8分)
【简答题】已知集合A= ,集合B= ,若B包含于A,则实数m的值是多少?
【多选题】某人连续3年每年末存入银行1000元,假定年利率为4%,每年复利两次,复利计息,三年后一次性取出本利和,可以取出W元,则下列等式正确的有( )
A.
W=1000×(F/P,2%,4)+1000×(F/P,2%,2)+1000
【多选题】某人连续 3 年每年末存入银行 1000 元,假定年利率为 4% ,每年复利两次,三年后一次性取出本利和,可以取出 W 元,则下列等式正确的有
A.
W = 1000× ( F/P , 2% , 4 )+ 1000× ( F/P , 2% , 2 )+ 1000
B.
W = 500× ( F/A , 2% , 6 )
C.
W = 1000× ( F/A , 4.04% , 3 )
D.
W = 1000× ( F/P , 2% , 3
【判断题】车削长径比L/D>10的细长轴类零件,在没有使用中心架和跟刀架时,由于径向力的作用,会使车削后的工件成为中凸形。
【单选题】The passage suggests that if there were a slight global warming at the present time, it would be ______.
A.
easy to measure the exact increase in temperature because of the abundances of temperature recording stations throughout the world
B.
difficult to prove that the warming was caused by the burning of fossil fuels
C.
easy to demonstrate the effects of the warming on the water vapor in the atmosphere
D.
difficult to measure the increase of CO2 in the atmosphere because of local variations in amount