A passenger plane is able to carry a fixed weight, including passengers and fuel.Which wing design would be best for such a plane?
A.Design 1
B.Design 2
C.Design 3
D.Design 4
To handle the question, you need to infer that the “best” design would be one that is most efficient in terms of its lift-to-drag ratio as well as in terms of fuel consumption. Fortunately,Tables 1 and 2 each show that design 2 is most efficient.
此题为判断题(对，错)。
你正在使用带有L1正则化的logistic回归做二分类，其中C是正则化参数，w1和w2是x1和x2的系数。当你把C值从0增加至非常大的值时，下面哪个选项是正确的?
A.第一个w2成了0，接着w1也成了0
B.第一个w1成了0，接着w2也成了0
C.w1和w2同时成了0
D.即使在C成为大值之后，w1和w2都不能成0
A. Add single DatePicker control to the design surface
B. Add single Calendar control to the design surface
C. Add single MediaElement control to the design surface to display a calendar
D. Add the appropriate Windows Forms references to the project references. Add a single Windows Forms DateTimePicker control to the design surface
A. Design 1 is a looped triangle design.
B. Design 2 is a looped triangle design.
C. Design 2 achieves quick convergence using RSTP.
D. Both designs supportstateful services at the aggregation layer.
E. Design 2 is the most widely deployed in enterprise data centers.
4.1 What are the values of weights wo, wl, and w2 for the perceptron whose decision surface is illustrated in Figure 4.3? Assume the surface crosses the xl axis at -1, and the x2 axis at 2. Ans. The function of the decision surface is: 2+2x1-x2 = 0, so w0 =2, w1 = 2, w2 = -1. 4.2. Design a two-input perceptron that implements the boolean function A ? B. Design a two-layer network of perceptrons that implements A XOR B. Ans. We assume 1 for true, -1 for false. (1) A ? B: w0 = -0.8. w1 = 0.5, w2 = -0.5. x1(A) x2(B) w0+w1x1+w2x2 output -1 -1 -0.8 -1 -1 1 -1.8 -1 1 -1 0.2 1 1 1 -0.8 -1 (2) A XOR B = (A ? B) (? A B) The weights are: Hidden unit 1: w0 = -0.8, w1 = 0.5, w2 = -0.5 Hidden unit 2: w0 = -0.8, w1 = -0.5, w2 = 0.5 Output unit: w0 = 0.3, w1 = 0.5, w2 = 0.5 x1(A) x2(B) Hidden unit 1 value Hidden unit 2 value Output value-1 -1 -1 -1 -1 -1 1 -1 1 1 1 -1 1 -1 1 1 1 -1 -1 -1 4.3. Consider two perceptrons defined by the threshold expression 022110+xwxww. Perceptron A has weight values: w0 = 1, w1 =2, w2 = 1. and perceptron B has the weight values: w0 = 0, w1 = 2, w2 = 1. True or false? Perceptron A is more-generalthan perceptron B. (more-generalthan is defined in Chapter 2.) Ans. True. For each input instance x=(x1, x2), if x is satisfied by B, which means 2x1+x20, then we have 2x1+x2 +10. Hence, x is also satisfied by the A. 4.5. Derive a gradient descent training rule for a single unit with output o, where 2211110.nnnnxwxwxwxwwo+=Ans. The gradient descent is:,.,1,)(0wnEwEwEwE?=?r)( )()()()(2122ididDdddddDdddDdddxxototwiototwiwiE-=-?-=-?=?The training rule for gradient descent is:iiiwww+=, where +-=?-=DdididddiixxotwEw)(2
A. when HSRP is not supported by the design
B. when multiple vendor devices need to be supported
C. when preempt tuning of the default gateway is needed
D. when a robust method of backing up the default gateway is needed
E. when the design implements Layer 2 between the access switch and the distribution switch
F. when the design implements Layer 3 between the access switch and the distribution switch
Refer to the exhibit. A network technician is asked to design a small network with redundancy. The exhibit represents this design, with all hosts configured in the same VLAN. What conclusions can be made about this design?（）
A.The design will function as intended
B.Spanning-tree will need to be used.
C.The router will not accept the addressing scheme.
D.The connection between switches should be a trunk.
E.The router interfaces must be encapsulated with the 802.1Q protocol.
