题目内容

最大应力与最小应力的数值相等,称之为()。

A. 对称循环交变应力
B. 非对称循环交变应力
C. 脉动循环交变应力

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感温式探测器能探测到火灾发生时产生的热量(热空气)信号,并把热量信号转化为()电信号.

A. 直流低压
B. 直流高压
C. 交流低压

原子吸收光度法测定空气中颗粒物和气溶胶的金属元素时,分割滤膜为何必须通过滤膜中心线?

Which two types of QoS functionality will be provided by Network-Based Application Recognition?()

A. NBAR provides the ability to configure MCQ; it is a mandatory MCQ component.
B. NBAR provides deep packet inspection and is used for advanced packet classification.
C. NBAR provides per-protocol packet and byte accounting functionality; it is used to track bandwidth utilization for all protocols described in the loaded PDLMs.
D. NBAR provides scheduling in an MQC policy map using an advanced algorithm.

电缆引入室内时,电缆的金属护套应进行屏蔽接地,电缆上挂电缆铭牌标明电缆的()、去向。

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