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【单选题】
第五套人民币10元纸币安全线包含的防伪措施是_____A.
全息、磁性、开窗
B.
磁性、萤火、开窗
C.
全息、荧光、开窗
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【单选题】设f(x)在x=a点可导，则|f(x)|在x=a不可导的一个充分条件是( )．
A.
f(a)=0，f'(a)=0
B.
f(a)=0,f'(a)≠0
C.
f(a)＞0，f'(a)＞0
D.
f(a)＜0，f'(a)＜0
【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】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?
【简答题】引起水泥安定性不良的原因有哪些?
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【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( )．