下列表示的是生活中一些物质的pH，其中呈酸性的是（） A．_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

下列表示的是生活中一些物质的pH，其中呈酸性的是（　　）

A．名称：牙膏；pH：8-9

B．名称：鸡蛋清；pH：7-8

C．名称：肥皂；pH：9-11

D．名称：橘子水；pH：3-4

答案

A、牙膏的pH大于7，呈碱性；

B、鸡蛋清的pH大于7，呈碱性；

C、肥皂水的pH大于7，呈碱性；

D、橘子水的PH小于7，呈酸性．

故选D．

单项选择题

男性，30岁，乏力、心慌、四肢反复出现紫癜3个月，查体：贫血貌，肝脾淋巴结未触及肿大，双上肢内侧可见片状出血，化验WBC 0.5×10 9/L，Ptc 50×10 9/L，Hb 80g/L，骨髓检查为脂肪髓，仅见网状细胞、浆细胞、组织嗜碱细胞，诊断的可能性是

A．白血病

B．血小板减少性紫癜

C．脾功能亢进

D．再生障碍性贫血

E．过敏性紫癜

填空题

用方框中所给词的适当形式填空

cost, open, choose, enter, sing, encourage, besides, mention, instead, nearly

1. Some children _____ songs happily while other children are playing soccer in the park.
2. Why don't we go out to have dinner tonight _____?
3.A car _____ hit me when I crossed the street yesterday afternoon.
4. After I failed my exam, my teacher and classmates all _____ me to work harder later on.
5. Does John know any other foreign language _____ French?
6.I don't think this jacket _____ you that much money.
7. Every one of us is able to _____ our way of life.
8. -When does the shop _____ every morning?
-At about eight thirty, I think.
9. -I'm married. Mr. Smith.
-What? You never _____ it to us that you are married, Linda.
10. Please don't _____ before knocking at the door.