海水的热膨胀具有什么特征?
参考答案:
不遵循热胀冷缩规律。高温时热膨胀系数值为正,低温、低盐时为负值。热膨胀系数由正转负时对应的密度最大。
以眼还眼,以牙还牙,如果别人侮辱我们,我们也可以用同样的手段辱骂他,诽谤他。[ ]
The department chairman ______ with thanks the assistance of all the faculty members for getting the celebration ready in a short time. A. expresses B. declares C. announcesD. acknowledges