AS168XAC3 528Kb/8PManual Motor Controller / Circuit Breaker for Equipment thermal-magnetic, 3 poles AS168XAC4 503Kb/7PManual Motor Controller / Circuit Breaker for Equipment thermal-magnetic, 4 poles More results 类似说明 - AS168XAC1 链接网址
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AS168XAC4 537Kb/8PManual Motor Controller / Circuit Breaker for Equipment thermal-magnetic, 4 poles More results 类似说明 - AS168XAC4 制造商部件名数据表功能描述 Schurter Inc.AS168XAC4 537Kb/8PManual Motor Controller / Circuit Breaker for Equipment thermal-magnetic, 4 poles ...
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③若ac<0,则方程ax2+bx+c=0必有两个不相等的实数根;④数学课本第40页观察与猜想讨论了一元二次方程根与系数的关系,根据这一关系得方程x2-3x+5=0的两根和是3,两根积是5.其中错误的有( ) A.3个 B.2个 C.1个 D.0个试题答案 在线课程 分析:...
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(4)把f(x)作为变量得到f(f(x))>f(x),即有(4)的结论. 解答:解:(1)观察图象得,a>0,c>0,则ac>0,所以(1)正确; (2)∵ax2+(b-1)x+c>0对所有的实数x都成立,且a>0, ∴y=ax2+(b-1)x+c的图象在x轴上方, ∴△<0,即(b-1)2-4ac<0, ...