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Qt包含了许多支持嵌入式系统开发的工具，有两个最实用的工具是（）和（）

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每个手机号通过江苏农信圆鼎卡移动充值缴费业务每日充值金额不得超过（）元。

A. 300
B. 500
C. 1000
D. 1500

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双金属片恒温器在电饭锅中主要是起到（）作用，恒温器的动作温度为（）。

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You have configured a Cisco Catalyst switch to perform Layer 3 routing via an SVI and have assigned that interface to VLAN 20. To check the status of the SVI， you issue the show interfaces vlan 20 command at the CLI prompt. You see from the output display that the interface is in an "up/up" state. What must be true in an SVI configuration to bring the VLAN and line protocol up？（）

A. The port must be physically connected to another Layer 3 device.
B. At least one port in VLAN 20 must be active.
C. The Layer 3 routing protocol must be operational and receiving routing updates from neighboring peer devices.
D. Because this is a virtual interface， the operational status will always be in an "up/up" state.

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下列不属于电路作用的是（）。

A. 连接电气器件
B. 转换其他形式能为电能
C. 处理
D. 电能转换其他形式能

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