友元类的所有成员函数都是另一个类的______。

下列反应的离子方程式正确的是（　　）

A．小苏打与氢氧化钠溶液的反应：OH^-+H⁺=H₂O

B．实验室制二氧化碳：CaCO₃+2H⁺=CO₂↑+H₂O+Ca²⁺

C．氯气与水反应：Cl₂+H₂O=Cl^-+ClO^-+2H⁺

D．AlCl₃溶液与过量氨水反应：Al³⁺+4NH₃•H₂O=AlO₂^-+4NH₄⁺+2H₂O

单词拼写。

1. The young man with glasses teaches _____ (我们) Chinese.

2. Will you please pass me a _____ (杯) of tea?

3. Your coat is green, but mine is _____ (红色的).

4. We had to stay _____ (在) home last Sunday, for it was raining all day.

5. He _____ (做) his homework late last night.

6. Both of the two girls look _____ (像) their father.

7. There are many _____ (公园) in Hangzhou.

8. Who's _____ (高), Lucy or Lily?

9. They go to _____ (上班) at eight every day.

10. Ann had her _____ (十) birthday in China. She felt very happy.

关于开拓新客户的方法，下列说法正确的是（）

A、多利用刊载本公司消息或本公司产品的报纸、杂志

B、参加同业的集会、同乡会、同学会、讲习会，以便搞好公共关系

C、一定要利用名人

D、与有关行业保持联系，以便获得有关的情况。

如图所示，天平右盘放砝码，左盘是一个水银气压计，玻璃管固定在支架上，天平已调节平衡，若大气压强增大，则（　　）

A．天平失去平衡，左盘下降

B．天平失去平衡，右盘下降

C．天平仍平衡

D．无法判定天平是否平衡

对党忠诚是做好公安工作的力量源泉。( )