在产品的介绍期，将价格高低与促销费用高低结合起来考虑，可以采取的策略有()
A. 缓慢撇脂策略
B. 快速渗透策略
C. 快速撇脂策略
D. 慢速渗透策略
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在家装弱电改造时，网线长度不够的，不允许使用接线法进行施工。
A. 正确
B. 错误
世界鞋号以脚长为依据制定。以毫米为度量单位，长度号差5mm或7.5mm，型差（）。
A. 1mm
B. 2mm
C. 3mm
D. 4mm
如果涡流试验线圈中试样的电导率减小，则试样中一定深度上的涡流大小将（）.
A. 增大；
B. 不变；
C. 减小；
D. 可能增大也可能减小
You have done a partial migration from 802.1D STP to 802.1w STP. Which of the following is true？（）
A. 802.1D and 802.1w interoperate only when the 802.1D STP domain supports rapid convergence.
B. Ports leading to 802.1D devices will run in compatibility mode， while the rest of the ports will run in 802.1w mode.
C. This is an invalid configuration and a partial migration cannot be done.
D. The bridge timers will be set to match the 802.1D devices.
E. A secondary root bridge will always be populated within the 802.1D domain.
F. If the root bridge is selected within the 802.1D domain， the whole STP domain will run in 802.1D compatibility mode.
G. In partially migrated 802.1w networks， it is recommended to keep the STP diameter below 4.
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