Take chemistry for example. The scientist always uses symbols to represent elements (元素). He uses the first letter of the name,capitalized,as the symbol. For example,the symbol for hydrogen (氢) is H,for oxygen (氧)is O,for nitrogen(氮) is N. With such symbols,he can form the ...
These days, many driver training car tailstock has pasted on one “CNG” the symbol, very many residents possibly did not know, this kind is take the natural gas as the fuel passenger vehicle, in will gradually harness the school bus, the patrol car, the environmental sanitation vehicle waits...
3. Three Shenzhou XV heroes successfully came back to the Earth ___ June 4, 2023. A. at B. on C. in D. until 4. Don’t ride your bike too fast, or you may hurt ___. A. myself B. yourself C. himself D. itself ...
We might not be alone in the universe. Actually, it may be confirmed as a very crowded place by new computer models developed to help identify habitable planets.Estimates of places where life can exist have been based on the possibility of them having su