题型:判断题 下列关于电场强度的说法中,正确的是 ( ) A.根据公式E=F/q可知,场强E跟电荷所受的电场力F成正比,跟放入电荷的电荷量q成反比B.由公式可知,在真空中由点电荷Q形成的电场中,某点的场强E跟Q成正比,跟该点到Q的距离r的平方成反比C.虽然正、负电荷在电场中的同一点所受的电场力方向相反,但该点的场强方向只有一个,即正电荷在该点的受力方向,也就是负电荷在该点受力的反方向D.由公式及均可以确定在真空中点电荷形成的电场中某点的场强,可见场强E与Q或q均有关 查看答案
题型:判断题 根据句意,从方框内选择合适的形容词填空。fresh, public, crowded, free, wonderful1. You mustn't do that in a _______ place.2. We've been having ________ weather recently.3. You don't have to pay; the exhibition is _______.4. This morning in the park the ________ air makes me feel quite good.5. He always prefers riding a bicycle rather than ride on a ________ bus. 查看答案