男性，40岁，双耳聋1年，1年前因肺结核行抗结核治疗，检查耳膜完整，电测听结果双耳感

阅读下面短文，用所给动词的适当形式填空，使短文完整、通顺。每空不限一词。

      Rose is one of the funniest girls in her class. She looks like a boy, and she is good at performing. So she

(1)________ (choose) to play Harry Potter by her classmates last week. She said happily, "I'm sure that I am

able to do the job well because I (2)________ (see) the movie many times already."

      Dick, one of Rose's best classmates, is also an actor in the play. He (3)________ (like) to perform the play

with Rose. He said, "We are confident that we (4)________ (do) well in our school art festival next week." 

      Mrs. Smith, their teacher, pays much attention to their play. She often encourages them. Yesterday

afternoon when she (5)________ (watch) their performance, she took photos of them.

下列说法正确的是（　　）

A．含有氧元素的化合物叫做氧化物

B．只含有一种元素的物质一定是纯净物

C．含有不同元素的物质，一定不是单质

D．由不同元素构成的物质叫做化合物

下列关于多能造血干细胞的叙述，哪项是错误的（）

A.造血干细胞形态和淋巴细胞相似

B.在特定条件下，可在脾内形成造血细胞结节

C.既能产生骨髓干细胞，又能产生淋巴细胞

D.具有高度的自我更新能力和向下进一步分化的能力

E.造血干细胞存在于骨髓中，血液中不存在

现有失去标签的两瓶无色溶液：稀盐酸和氯化钠．某兴趣小组设计用化学方法和物理方法区分它们．请回答有关问题．

（1）化学方法：在不选用酸碱指示剂、pH试纸的情况下，按表中方法一（示例）填写．所选试剂须属不同类别（类别是指单质、氧化物、酸、碱、盐等）．

	所选试剂	判断方法
方法一	______	______
方法二	______	______

（2）物理方法：同学小王仅使用了酒精灯和玻璃棒两种仪器，就把这两种无色溶液区分开来了．请你猜测一下他的做法（简要叙述操作方法）．

______．

电控汽油喷射发动机诊断测试的基本原则有哪些？