【单选题】设函数f(x)在点x=a处可导,则甬数|f(x)|在点x=a处不可导的充分条件是( ).
【单选题】设f(x)在点x0处连续,则下列命题中正确的是( ).
【单选题】The battle of Trenton was very important to Washington because______.
A.
it gave Washington the victory he needed
B.
it was his last battle as a general
C.
he defeated all the British soldiers
D.
it won the war for American independence
【单选题】Washington's greatness showed itself in that______.
A.
Washington worked under the Continental Congress
B.
Washington limited his role to being administrators of the laws
C.
Washington was both a great administrator and a great leader
D.
Washington established the precedent of the two-term Presidency
【简答题】引起硅酸盐水泥安定性不良的原因有哪些?各如何检验?建筑工程使用安定性不良的水泥有何危害?水泥安定性不合格怎么办?
【单选题】设f(x)在点 可导,则 是f(x)在点 处取得极值的( )