经常用计量标准或标准物质对测量仪器进行调整或校准,是为了尽可能消除()
A.总误差
B.随机误差
C.人为干扰
D.不确定度
E.系统误差
参考答案:E
To tell the truth, I would rather that I ____ the pain instead of you. You don’t know how worried I was.
A.took
B.had taken
C.have taken
D.should have taken
质量为2 t的汽车,所受阻力是车重的0.2倍,在水平公路上行驶所能达到的最大速度为15m/s,则此汽车发动机的额定功率是 kw.