皮皮学，免费搜题
登录
搜题
【单选题】
设z=f(x，y)=x 4 +y 4 -x 2 -2xy-y 2 ，由f x (x，y)=0及f y (x，y)=0求得临界点M 0 (0，0)，M 1 (1，1)，M 2 (-1，-1)，则( )．A.
f(M 0 )是极大值
B.
f(M 1 )与f(M 2 )都是极大值
C.
f(M 0 )是极小值
D.
f(M 1 )与f(M 2 )都是极小值
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】When comparing two firms, an yst shouldmost appropriately adjust the financial statements when they include significant: A. acquisition goodwill, if one of the firms reports under IFRS and the oth...
【单选题】Comparing the time scales between many flu epidemics, scientists can ______ when another one might happen.
A.
determine
B.
anticipate
C.
predict
D.
assure
【多选题】When comparing and contrasting the similarities and differences between bridges and switches, which of the following are valid statements? Choose all the valid answer choices)
A.
Bridges are faster than switches because they have fewer ports.
B.
A switch is a multiport bridge,
C.
Bridges and switches learn MAC addresses by examining the source MAC address of each frame. received.
D.
A bridge will forward a broadcast but a switch will not.
E.
Bridges and switches increase the size of a collision domain.
F.
None of the above statements are true.
【单选题】When comparing the cost of competing projects, which of the following is typically NOT considered?
A.
Opportunity costs.
B.
Direct costs.
C.
Sunk costs.
D.
Indirect costs.
E.
Burden rates.
【简答题】两个弹簧振子的周期都是0.4s,设第一个振子从平衡位置向负方向运动,经过0.5s后,第二个振子才从正方向的端点开始运动,则这两振动相位差为 。
【单选题】When comparing the air with 50% of relative humidity with the air with 100% of relative humidity, which one will hold more water?
A.
the former
B.
the latter
C.
not for sure
D.
same each other
【简答题】 工程实际应用中,利用平衡电桥可以解决什么问题?电桥的平衡条件是什么?
相关题目：