在流体静力学基本方程式的几何意义中,Z+p/γ的意义是()。
A、压力水头
B、测压管水头
C、基准面高度
D、位置水头
参考答案:B
根据所给中文意思,用正确的形式填空。
小题1: He wanted to catch the butterfly, but _____ _______ ______ the ground.(扑倒在…上)
小题2:The doctor has _____(治愈) many people of such a disease.
小题3:Read the stories and answer the questions ___ _____(如下).
小题4:During the war, German ______ (占领)many countries, including France.
小题5:There was an ________ (被遗弃的)house by the riverside.
小题6:She could hardly ______ ________(忍住笑声).
设NA为阿伏伽德罗常数的值。下列叙述正确的是( )
A.1mol Al3+离子含有的核外电子数为3NA
B.25℃,pH=13的NaOH溶液中含有OH-的数目为0.1NA
C.1mol Cl2与足量的铁反应,转移的电子数为3NA
D.常温常压下,Na2O2与足量H2O反应,共生成0.2molO2,转移电子的数目为0.4NA