Who has the sixth grade grade second volume product society examination paper~~~ Our school is people's education press. The content is relatively simple. There are only four units. I don't know what I will take the exam. I haven't taken the exam before. I have to take the exam this year, so I'm pressed for time. Please help me~

Mainly review the book content, and the teacher's emphasis
Read more, think more, try your best, don't be too nervous

Review questions of sixth grade science society of Jiangsu Education Press

It's the best way to dispose of the rubbish by dumping it into the ocean. (x) 2 making landfills on the seashore can not harm the environment, and can let the rubbish and sewage directly discharge into the ocean. (x) 3 "impact theory" is a generally accepted view on the formation of craters on the moon, which we should not doubt

Who has the review question of Shandong Art Edition sixth grade society volume two?
Shandong art version of the sixth grade of the review problem ~ to all units, thank you!

Baidu search: preparing lessons for Grade 6 of Shandong Art Society

Some sockets are written with 250V, while the plug on the appliance is written with 220V. If the two are inserted together, will the appliance burn out?
I have a wireless microphone receiver that's broken

That's the maximum allowable voltage. Its output voltage is 220 V in China. Your appliance is 220 v. if you plug it in, it won't burn
Your infinite microphone receiver is broken. It may be a quality problem

The school where the nickname is located is going to buy a prize with a sum of money. If one pen and two notebooks are used as a prize, 60 copies can be bought. If three pens and one notebook are used as a prize, 30 copies can be bought. How many pens or notebooks can be bought with this sum of money?

Suppose X Yuan for each pen and Y yuan for each diary
60(x+2y)=30(3x+y)
2x+4y=3x+y
x=3y
(* that is to say, the price of a pen can buy three diary Books)
So if you buy all the pens, you can buy 100
If you buy all the diaries, you can buy 300

If you use a 220 V 6 V electric lamp connected to a 220 V power source for 3 hours every night, how much electricity is consumed in a month?

Is it wrong? 220 V / 6V? Should it be 220 V / 6W?
3 hours per night, 30 days per month, 90 hours in total, 6 × 90 = 540 (WH) = 0.27 kwh = 0.54 kwh per month
The power consumption is 0.54 degree per month

Let a.b.c.d be integers, and M = a ^ 2 + B ^ 2, n = C ^ 2 + D ^ 2, Mn can be expressed as the sum of the squares of two integers, and its integral formula is?

mn=(a2+b2)(c2+d2)
=a2c2+2abcd+b2d2+a2d2+b2c2-2abcd
=(ac+bd)2+(ad-bc)2
=(ac-bd)2+(ad+bc)2,
Therefore, the form of Mn is (AC + BD) 2 + (AD BC) 2 or (AC BD) 2 + (AD + BC) 2

In the experiment of Thevenin's theorem, how to measure the equivalent parameters without measuring the open circuit voltage and short circuit current?

Don't measure the open circuit voltage: you can measure the current between two points. Generally, if there is current passing through the surface, there is voltage. Short circuit current: you can measure the resistance between two points. You can make sure that there is a normal power supply, and the resistance between the two poles of the power supply is 0

In order to determine the mass fraction of zinc in a brass sample (regardless of other impurities in brass), 15ml dilute hydrochloric acid is added to 5g brass sample powder three times. After each full reaction, the mass of hydrogen is determined. The experimental data are as follows: for the first time, 5ml dilute hydrochloric acid is added, the mass of hydrogen is 0.04g; for the second time, 5ml dilute hydrochloric acid is added, When 5ml dilute hydrochloric acid is added for the third time, the mass of hydrogen is 0.02g?

Because hydrogen is still generated in the third time, the mass of HCl in the second time is still small. Because the amount of HCl added in each time is the same, the mass of hydrogen generated in the second time is the same as that in the first time, that is, M = 0.045g, the total mass of hydrogen generated in the sample is 0.04 + 0.04 + 0.02 = 0.1g, because only Zn can react

What is the power of a 127 volt 15 Watt CFL at 220 volts

If the withstand voltage is 127V 15W energy-saving lamp. How can you install it at the voltage of 220V? As soon as you receive the voltage of 220V, it will burn immediately. Is there any power? If your energy-saving input voltage is broadband (100V ~ 240V), then connect it to the voltage of 220V. The power deviation is about 1W, that is 15.5w. If the power is small, the deviation is large. The power is almost the same. 127V is connected to the voltage of 220V, As the voltage increases, the input current decreases. P = UI. So the power is almost the same