【简答题】函数f(x)= x ax+b (a,b是非零实常数),满足f(2)=1,且方程f(x)=x有且仅有一个解. (1)求a、b的值; (2)是否存在实常数m,使得对定义域中任意的x,f(x)+f(m-x)=4恒成立?为什么? (3)在直角坐标系中,求定点A(-3,1)到此函数图象上任意一点P的距离|AP|的最小值.
【判断题】系统风险又称为可分散风险或可回避风险。()
【单选题】Notched samples will show variation in mechanical properties compared with smooth samples under static loading, which phenomenon is not notch effect?
A.
strain rate increase at notch tip
B.
stress concentration at notch tip
C.
yield stress reduce at notch tip
D.
strain concentration at notch tip
【简答题】系统风险又称为__ _。 A、不可分散风险 B、可分散风险 C、特有风险 D、质量风险
【单选题】The fine needles are used ______.
A.
to make the first rough outline
B.
to finish the rough outline
C.
to make the approved drawing
D.
to ink in the rough outline