【单选题】在维持机体稳态的自动调节过程中起基础作用的是
【判断题】一定温度下,可逆反应 PCl 5 (g) =PCl 3 (g) + Cl 2 (g) 达到平衡后,维持温度和体积不变,向容器中加入一定量的惰性气体,反应将不移动
【单选题】一定温度下,当可逆反应 PCl 5 (g)===PCl 3 (g)+Cl 2 (g) 达到平衡时,系统总压为 pkPa , PCl 5 (g) 的转化率为 50% ,则相同温度时该反应的平衡常数 K Ө 为 ( )。
【简答题】Those who love green are ________ , selfish, critical, sarcastic and stubborn.
【单选题】锋面气旋的形成通常是: I.先有锋面,尔后在锋面上产生气旋;II.先有气旋尔后在气旋中形成锋面;III.原锢囚锋气旋已减弱,有副冷锋侵入形成新的锋面气旋。
【单选题】一年轻患者,男,24岁。夏秋季因饮食不慎出现泄泻腹痛,泻而不爽,胸腹满闷,口干不欲饮,舌苔微黄而腻,脉濡缓。根据上述辨证特点,下列治法中何者为宜()
【单选题】From the sentence 'he has been able to release the sun's heat that is trapped in things such as wood, coal and oil' we know______.
A.
man can get heat from things like wood, coal and oil
B.
man cannot get the heat directly from the sun
C.
only wood, coal and oil have heat
D.
all the sun's heat is trapped in things
【单选题】在一定条件下,将PCl 3 (g)和Cl 2 (g)充入体积不变的2 L密闭容器中发生下述反应:PCl 3 (g)+Cl 2 (g) PCl 5 (g),5 min末达到平衡,有关数据如表。 PCl 3 (g) Cl 2 (g) PCl 5 (g) 初始浓度(mol·L -1 ) 2.0 1.0 0 平衡浓度(mol·L -1 ) c 1 c 2 0.4 下列判断不正确的是( )
A.
若升高温度,反应的平衡常数减小,则正反应为吸热
B.
反应5 min内,v(PCl 3 )='0.08' mol·L -1 ·min -1
C.
当容器中Cl 2 为1.2 mol时,可逆反应达到平衡状态
D.
平衡后移走2.0 mol PCl 3 和1.0 mol Cl 2 ,在相同条件下再达平衡时,c(PCl 5 )<0.2 mol·L -1
【简答题】阅读理解。 Green Farm offers an ideal (理想的) country setting that you and your family can enjoy. Our farm is perfect for those who live in Florida. The whole family will have a chance to enjoy the quiet cou...
【简答题】Those who love green are also persistent and may be ________ .