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【简答题】
已知函数f(x)= - x 3 + x 2 +bx+c,x<1 alnx,x≥1 的图象过坐标原点O,且在点(-1,f(-1))处的切线的斜率是-5. (I)求实数b、c的值; (Ⅱ)求f(x)在区间[-1,2]上的最大值; (Ⅲ)对任意给定的正实数a,曲线y=f(x)上是否存在两点P、Q,使得△POQ是以O为直角顶点的直角三角形,且此三角形斜边中点在y轴.若存在请证明,若不存在说明理由.
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举一反三
【单选题】When troubleshooting an 802.11g network. Which of the following can interfere with the network?()
A.
2.4 GHz cordless phone
B.
900 MHz cordless phone
C.
Bluetooth headset
D.
Bluetooth printer
【单选题】When troubleshooting hardware issues with a server, which of the following is MOST likely to cause a problem in receiving vendor support?()
A.
Third party cables
B.
Third party memory
C.
Signed drivers
D.
Server type
【多选题】When troubleshooting a possible misconfiguration between the LAC and LNS, what are two tools used to compare them?() (Choose two.)
A.
show aaa-domain map on the LAC
B.
show aaa-domain map on the LNS
C.
show l2tp destination profile on the LAC
D.
show l2tp destination profile on the LNS
【单选题】下列行为违背了导游人员与有残疾旅游者交往原则的是()。
A.
安排行程时注意游览的节奏
B.
给残疾人适当的照顾
C.
把残疾人当普通游客对待,不施与任何帮助和理解
D.
残疾人坚决拒绝帮助就不强行坚持
【单选题】k30 试验下沉量基准1.25mm对应的荷载强度σs为0.199MPa,地基系数K30为(     )MPa。
A.
0.159
B.
159
C.
113
D.
0.113
【多选题】K30 试验达到下列条件(      )之一时,试验即可终止。
A.
总下沉量超过规定的基准值(1.25mm),且加载级数至少5级
B.
荷载强度大于设计标准对应荷载值的1.3倍,且加载级数至少5级
C.
荷载强度达到地基屈服点
D.
荷载加载级数达到5级。
【单选题】沟通最大的阻力就在个人表达的“不完整性”如何理解?
A.
语言都有表达的局限性
B.
相同词汇不同人理解不同
C.
人们只能表达想表达的部分信息
D.
通过不完整来表达隐含意思
【单选题】When troubleshooting ATM, which command would allow you to test reachability from one side of an ATM cloud to the other?()
A.
ping atm vci 0.100 interface at-0/1/0 end-to-end
B.
ping atm vci 0.100 interface at-0/1/0 circuit
C.
ping atm vci 0.100 interface at-0/1/0 far-end
D.
ping atm vci 0.100 interface at-0/1/0 final-hop
【单选题】Which of the following is unsafe for a technician to use when troubleshooting or repairing a CRT monitor?()
A.
Anti-static pad
B.
Anti-static wrist strap
C.
Rubber gloves
D.
Multimeter
【单选题】When troubleshooting Ethernet connectivity issues,how can you verify that an IP address is known to a router?
A.
Check whether the IP address is in the routing table
B.
Check whether an ACL is blocking the IP address
C.
Check whether the IP address is in the CAM table
D.
Check whether the IP address is in the ARP table
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