题目内容

Read aloud paragraphs 30-33 until you have learned them by heart. Then try to complete the passage from memory.After he (1)_________, I thought more and more about Tony’s career. He (2)_____________in my mind. In the end, I think he stood as tall, and as (3)_____, as the greatest American industrialists.They had all reached their success by the same(4)____ and by the same (5)______________: vision, determination, self-control, optimism, self-respect and, (6)_________, integrity.Tony did not begin on the (7)______rung of the ladder. He began in the basement. Tony’s affairs were (8)____; the greatest industrialists’affairs were(9)____. But, after all, the (10)_____________were exactly the same. The only difference was where you put the decimal point.

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下列各电子结构式中,表述正确的是( )(1)1s22s1 (2)1s22s22d1 (3)1s22s12p2(4)1s22s22p13d1 (5)1s22s42p2 (6)1s22s22p63s23p63d1

A. 表示基态原子的电子排布只有(1)
B. 表示激发态原子的电子排布有 (2)(3)(4)(6)
C. 原子电子错误排布的只有(5)

下列各组量子数中, 组代表基态Al原子最易失去的电子,

A. 1,0,0,-1/2
B. 2,1,1,-1/2
C. 3,0,0,+1/2
D. 3,1,1,-1/2

元素Ti的电子构型是[Ar]3d24s2,试问这22个电子,下列表述正确的是:

A. 共占据着11个原子轨道.
B. 共填充3个电子层,7个亚层,
C. 价电子为最外层电子,共有2个
D. 单电子轨道有2条。

通常通过修改以下哪个寄存器,改变输出的PWM波的占空比?

A. TIMx_CNT
B. TIMx_CCR1
C. TIMx_PSC
D. TIMx_ARR

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