A:合金丝的电阻跟该合金丝的横截面积有关
B:合金丝的电阻跟该合金丝的长度无关
C:合金丝两端的电压越大,合金丝的电阻越大
D:通过合金丝的电流越大,合金丝的电阻越大
若代数式4x2-2x+5=7,那么代数式2x2-x+1的值等于()
-- Look! The man is __________ the poster at the bus stop.
-- Let's go and stop him. We should keep our city clean.
—I'm thirsty.I want some water. —OK, let's go to the shop now.