循环流化床锅炉给水品质的指标有哪些？

Joe wanted a computer. He asked his ______ for the money and they said he must get it himself. But how did he get it? He ________ about this when he walked home. Not many people wanted to ask children to work for them. Maybe he could take away snow for the neighbors. But this was not _______ . He had to wait a long time for that. He couldn’t cut grass for their gardens _____ he had no tools to do the work with.

Then he saw one of his classmates, Dick, delivering (送) _______ . I could do that, he thought. Maybe I could even get the computer ________ away. I could pay _______ it a little each week. He ran to _______ up with Dick. Joe asked him a lot of questions. He learned that it was _______ to get twenty-five dollars each week. He learned that the job took __________ three hours each night. Dick ______ him the phone number of the newspaper manager.

Joe almost flew home. After he had told his mother ________ he thought, she _____ .“I think it is a _______ idea,” she said, “I’ll call the newspaper….”

“Wait, Mum,” Joe said, “I’ll call. After that, I’m going to be a businessman now.”

Joe’s mother smiled __   .

已知将盐酸滴入高锰酸钾溶液中，产生黄绿色气体，而溶液的紫红色褪去，发生的反应：2MnO₄^- +16H⁺ + 10Cl^- === 2Mn²⁺ + 5Cl₂↑ + 8H₂O。现有一个氧化还原反应中，已知反应物和生成物有KCl、H₂SO₄、

KMnO₄、MnSO₄、H₂O、K₂SO₄、Cl₂。

(1)已知该反应中，KMnO₄得到电子，写出一个包含上述七种物质的氧化还原反应方程式(不需要配平)

_____________________________；则反应的还原剂为________________

(2)上述反应中，1mol氧化剂在反应中得到__________电子

(3)如果在反应后的溶液中加入NaBiO₃，溶液又变回紫红色，请判断下列正确的是____________

A.氧化性：BiO₃^-＞MnO₄^-＞Cl₂ B.氧化性：BiO₃^-＞Cl₂＞MnO₄^-

C.氧化性：MnO₄^-＞BiO₃^-＞Cl₂ D.氧化性：Cl₂＞MnO₄^-＞BiO₃^-

有关地球自转速度的叙述，正确的是

    ①每天大约向东转15°

    ②广州、杭州、北京三地的地球自转线速度依次增大

    ③南北纬60°处，地球自转线速度均为赤道处的一半

    ④地球同步卫星与地面上对应点相比，角速度相同，线速度不同 [ ]

A、①②

B、①③

C、③④

D、②④

豌豆是自花授粉植物。( )

次龙骨的安装应符合哪些要求？