The main idea of paragraph 4 shows us______.A. some examples of shooting in the US schools.B. the American's feeling.C. some famous schools.D. that some teachers were killed by students.
题目
The main idea of paragraph 4 shows us______.
A. some examples of shooting in the US schools.
B. the American's feeling.
C. some famous schools.
D. that some teachers were killed by students.
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第1题：
请向我们提供一些有关网上购物的信息。
Please________ us________ some________ ________shopping online．
正确答案：
14． providelsupply; with} information about 【解析】此题考查provide/supply sb． with sth．“提供给某人某物”。 -
第2题：
Which paragraph gives an account of the way electrochromic windows changing?A.Paragraph 5.
B.Paragraph 3.
C.Paragraph 4.
D.Paragraph 6.答案：A解析： -
第3题：
【填空题】单位换算：（答案直接写整数，不要用科学计数法） 1us = ___________ ns 1ms = ___________ us 1s = ___________ ms 1s = ___________ us
1at=10.33m H 2 O -
第4题：
所示电源与图a)所示电路等效，则计算U'S和R0的正确算式为：
A. U'S=US+ISR1，R0=R1//R2+R3
B.U'S=US-ISR1，R0=R1//R2+R3
C. U'S=US-ISR1，R0=R1+R3
D.U'S=US+ISR1，R0=R1+R3答案：C解析：提示:根据戴维南定理，图b)中的电压源US'为图a)的开路电压，电阻R0的数值为图a)的除源电阻。
US' =US+R1(-IS)
R0=R1+R3 -
第5题：
读程序写结果 main（) { char s[ ]="12sxfvgrtfh65 " ; s[4 ]=‘0’; puts（s ); }
0 -
第6题：
SysTick系统定时器延时1s的写法可以是（）
A．Delay_us(1000000);
B．Delay_us(500000); Delay_us(500000);
C．Delay_us(400000); Delay_us(500000); Delay_us(100000);
D．Delay_us(1000000); Delay_us(1000000);
BC