皮皮学，免费搜题
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【单选题】
没有余额的账户"借或贷"栏内写( )。A.
"借"
B.
"贷"
C.
"平"
D.
0
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】Ecotourism relies on
A.
government aid exclusively.
B.
local people and their donations of time and money.
C.
initial loans at the beginning, followed by support from tourists.
D.
government assistance through agencies and local disposable income.
【简答题】如果计数频率为10KHZ,设定TIM2_ARR为 100-1 ,则TIM2定时中断的频率为( )HZ。
【多选题】开关的灭弧方式很多,主要有
A.
采用压缩弹簧，使开关高速断开
B.
利用空气或某些气体吹弧，使电弧迅速冷却和拉长
C.
使电弧与固定介质接触，使电弧拉长并迅速冷却
D.
将电弧分成若干段，以利熄弧
E.
将触头置于绝缘油中，使电弧迅速冷却
【单选题】A navigator's chronometer will always show
A.
Greenwich time
B.
noon time
C.
local time
D.
sun time
【单选题】In the video, Tim says that his local community in the US would give a lot of scholarships to students who graduate from________________.
A.
the local kindergarten
B.
the local primary school
C.
the local high school
D.
the local university
【简答题】假设定时器TIM2的预分频值为PrescalerValue,计数初值为ARRValue,请完善定时器初始化程序。 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); TIM_TimeBaseStructure.TIM_Prescaler = _____...
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