【单选题】下列哪项最满足心力衰竭的概念:A 心输出量低于正常 B 心脏每搏输出量降低 C 心输出量绝对或相对减少,难以满足机体代谢需要D 由原发性心脏舒缩功能障碍引起的泵衰竭
【判断题】正截面承载力计算的基本假定 中, 不考虑混凝土的抗拉强度 , 拉力全部由钢筋承担。
【判断题】受弯构件正截面承载力计算的基本假定中,不考虑混凝土的受拉强度,全部拉力均由纵向受拉钢筋承担,主要因为其对弯矩的贡献很小。
【判断题】分流道设计时,究竟采用那一种横截面的分流道,即应考虑各种塑料成型的需要,又要考虑到制造的难易程度。
【简答题】钢筋混凝土受弯构件正截面承载力计算有哪些基本假定?其中的“平截面假定”与均质弹性材料 ( 例如钢)受弯构件计算的平截面假定情况有何不同?
【多选题】Ways to Improve Your Health Sometimes it may seem difficult to improve our health.If so,the following health habits may help you. ●1 ( ) Research shows that eating a meal in the morning results in les...
B.
Eat breakfast every morning.
C.
It can also cause traffic accidents!
D.
An active mind is a healthy mind!
E.
Spending time with others is very helpful.
F.
Everyone could get a little more joy in their lives!
G.
Walking is an easy way to add exercise to our lives.
【简答题】3-8 钢筋混凝土受弯构件正截面承载力计算有哪些基本假定?其中的 “ 平截面假定 ” 与均质弹性材料(例如钢)受弯构件计算的平截面假定情况有何不同?
【单选题】Why Chang' aa is popular in poor areas?
B.
It can make people highly dizzy.
C.
It provides way for poor people to escape from the misery of slum living.
D.
People who sell it can get great profit.
【判断题】分流道设计时,究竟采用那一种横截面的分流道,即应考虑各种塑料成型的需要,又要考虑到制造的难易程度;
【单选题】土透水性的强弱可用土的哪一个指标来反应?