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1. You’d better pick me ________ outside the theater at 8:30 pm.2. Some impractical suggestions were turned _________ by the committee.3. A review of you monthly expense helps you stay _________ budget instead of straying from your target.4. All disputes __________ connection with this contract shall be settled through friendly negotiation.5. The future science will help us realize the dream that one day we can interact ___________ a robot as if it werea person.6. This disease is specific ________ this area.

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直流升压斩波电路当占空比D越接近1。

A. Ud越高
B. Ud越低
C. 与Ud值无关
D. Ud值不变

直流升压斩波电路Ud的大小与值有关。

A. 频率f
B. 占空比D
C. 周期T
D. 初相位

Cuk电路当时,Ud

A. 0≤D≤0.5
B. 0.5≤D<1
C. 1≤D
D. 1≤D≤2

Cuk电路与Buck-Boost电路的降压和升压功能一样。( )

A. 对
B. 错

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