The most important parameters affecting a rocket's maximum flight velocity is the relationship between the vehicle's mass and the amount of propellant It can carry.
此題答案是A
雖然我選對了！但是有點半猜半就的...
1.對於C的amount，感到很奇怪...本來想選他的，可是看到後面的propellant是單數，不敢選下去
2.紅字的It，應該是當時打錯的吧...是小寫吧？！
3.the amount of propellant it can carry...不太懂這句話耶！可以煩請解釋一下嗎？
問題真多...煩請版上大大解答
屑屑...
