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1. Because when the ring is hung on the hook, the tension and gravity are a pair of balanced forces, which cancel each other, so it is not necessary to calculate the tension on the ring

2. Elasticity includes pulling force, supporting force, pressure and so on. The gravity on the dynamometer can be regarded as the pulling force on the spring, so it has a pulling effect on it.

3. Because when the spring dynamometer is in normal use, the elongation of the spring is the result of the gravity or tension of the object, while the gravity of the spring dynamometer itself does not act on the spring and is directly borne by the pull ring of the dynamometer
however, when the spring dynamometer is hung upside down for use, the gravity of the spring itself has acted on the spring to make the spring elongate when the weight is not hung, and then the weight is hung to lengthen the spring. Therefore, when the force is measured in this way, the force is equal to the indication of the dynamometer minus the dead weight of the dynamometer. On the other hand, knowing the magnitude of the force and the dead weight of the dynamometer, the indication of the dynamometer at this time can also be obtained.

4. Blockchain development framework

6. In the "dial-up keyboard" interface,
input the
* 5005 * 7672 * SMS center number #
after the correct input, click "call" to complete the setting
note: for "+" people, long press the 0 key (or use 00 instead).

7. Please reply to the original factory settings. Then the direct way is to take it to the mobile business hall, or the mobile phone store to brush off the machine.

8. 1. The number of SMS center in different provinces and cities is different. You can contact customer service for specific number of SMS center
2. The SMS center number, + and 86 can't be less in the SMS settings of mobile phone. Add the SMS center number of SIM card home
3. The method of setting SMS center number on iPhone is as follows:
1. Query method: Dial * # 5005 * 7672 with iPhone
2. Setting method: Dial * 5005 * 7672 * + 86 "SIM card home SMS center number" with iPhone
3. Deletion method: Dial # 5005 * 7672 # with iPhone

warm tips: the SMS center number is usually set as + 86 followed by a mobile phone number, similar to the mobile phone number. When setting the SMS center number, please plug in and unplug the SIM card again. It is recommended to delete the SMS center number first and then reset it.

9. The Vol in the futures chart refers to the trading volume of futures

futures trading volume refers to the bilateral cumulative quantity of a certain futures contract on the same day, and the unit is "hand"

1. The basic (minimum) trading unit of futures is (a) contract, commonly known as "hand"

2. Trading volume is the number of contracts that have been concluded, which is calculated bilaterally (buy and sell), so it must be an even number

3. For example, a buys 10 hands (10 contracts) at the price of 1234 yuan, and B sells 10 hands at the price of 1234 yuan, Trading volume is 20 hands

4. In the market, the trading volume of the same variety in different months is calculated separately, which adds up to the trading volume of this variety. Daily turnover, monthly turnover.

10.

Bid price is the highest price buyers are willing to pay. There are many other prices, but they are all lower than the highest price

ask price is the lowest price offered by the seller. There are other quotations, but they are all higher than this price