患者左上后牙颊侧牙龈肿胀，疼痛3天。检查间颊侧牙龈呈卵圆形膨隆，波动感（+），若诊断

下列各组离子在指定的环境中能大量存在的是（　　）

A．pH=1的无色溶液中：SO₄^2-、Cu²⁺、Na⁺、Cl^-

B．能使石蕊试纸变蓝色的溶液中：Na⁺、K⁺、S^2-、CO₃^2-

C．加入铝粉能产生H₂的溶液中：NH₄⁺、Na⁺、Fe²⁺、NO₃^-

D．水电离出的c（H⁺）=1×10^-12mol/L的溶液中：K⁺、Na⁺、Cl^-、HCO₃^-

用正确的单词补全对话

Tina: I have never been late for school. But yesterday morning. . .

John: What   1  ?

Tina: Well, first of all I   2  .

John: Did you have an alarm clock?

Tina: Yes, but it didn't   3_ By the time I got up, my brother had already   4   into the bathroom.

John: Oh, what a pity!

Tina: So, after he got out of shower, I   5   a quick shower and got dressed. But by the time I went

outside, the bus   6  .    

John: Oh, no! How did you go to school?

Tina: I ran all the   7   to school. But when I got to school, I   8   I had left my backpack at home.

John: You must be   9   for class, right?

Tina: You are right. I got to school very late. I   10   an apology to my teacher.

John: No wonder you look stressed out.

对换热器来说，具有腐蚀、毒性、温度压力很高的介质，均应走（）。

A、壳程

B、管程

C、副线

D、调节阀

铈量法测定吩噻嗪类药物的含量，下列说法中不正确的是

A．属于氧化还原滴定法

B．在适当的酸性条件下进行

C．片剂辅料对于测定有影响，应设法排除

D．可以用于片剂及原料药的含量测定

E．终点时硫酸铈红色消失，可以不用外加指示剂

在大型建设工程项目中，信息交流的问题导致工程变更和工程实施的错误约占工程总成本的 ( )。

A．1%～3%

B．2%～4%

C．3%～5%

D．4%～6%