题目: 下列各种现象与所涉及的物理知识说法错误的是 [ ]A. 红外线夜视仪——红外线的热效应 B. 书桌上的玻璃板“反光”——发生了镜面反射 C. 水下潜水艇能够上浮——液体的压强和深度的关系 D. 利用高压锅容易将饭煮熟——沸点和气体压强的关系 答案: 答案:C
题型:选择题 If I hadn't stood under the ladder to catch you when you fell, you_______ now. [ ]A. wouldn't be smiling B. couldn't have smiled C. didn't smile D. won't smile 查看答案