A:重力势能逐渐增加,动能也逐渐增加
B:重力势能逐渐增加,动能逐渐减少
C:重力势能逐渐减少,动能也逐渐减少
D:重力势能逐渐减少,动能逐渐增加
—Is _______ ready for the picnic? —No, _______ is wrong with my bike. I can't go bike riding with you.
下列食品运用发酵技术的是( )
①葡萄酒 ②地瓜干 ③甜面酱 ④老酸奶 ⑤火腿肠 ⑥豆腐.
Look! The cat likes this ______.