题目内容

如果TIM3的自动装载寄存器为100-1，预分频寄存器为720-1，则执行：TIM_SetCompare3(TIM3,50)后，输出的占空比约为？

A. 0.5%
B. 20%
C. 50%
D. 75%

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以下说法正确的组合是？

A. PWM波的优点包括从处理器到被控系统信号都是数字形式的，无需进行数模转换
B. 由于PWM波的电平只有高电平与低电平两种，因此它只能控制数字器件
C. STM32的TIM2~TIM5均可以至多输出4路PWM波
D. STM32的TIM2输出PWM波时，可以选择任何一个通用IO，没有任何限制
E. TIMx_CCRy寄存器越大时，输出波形的占空比总是越大

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The purpose of pre-reading is to facilitate________ activities.

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In conclusion, anyway student’s predictions, whether right or wrong, will not get his mind closer to the theme of the passage.

A. 对
B. 错

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Seting the scene means getting the students familiarised with the cultural and social background knowledge relevant to the reading passage.

A. 对
B. 错

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如果TIM3的自动装载寄存器为100-1，预分频寄存器为720-1，则执行：TIM_SetCompare3(TIM3,50)后，输出的占空比约为？

A. 0.5% B. 20% C. 50% D. 75%

以下说法正确的组合是？

The purpose of pre-reading is to facilitate________ activities.

In conclusion, anyway student’s predictions, whether right or wrong, will not get his mind closer to the theme of the passage.

Seting the scene means getting the students familiarised with the cultural and social background knowledge relevant to the reading passage.

A. 0.5%
B. 20%
C. 50%
D. 75%