一套机械密封至少有()个密封点。A.1 B.2 C.3 D.4

题型:单项选择题

问题:

一套机械密封至少有()个密封点。

A.1

B.2

C.3

D.4

考点:工程与技术科学现代密封技术现代密封技术题库
题型:单项选择题

据汉语提示及句子意思,在句中横线上填入适当的单词或词组(每空限填一词)。

1. _________ (六月) is the 6th month of the year, between May and July.

2. Can you give me some pieces of _________ (建议) on how to learn English well?

3. The woman doesn't feel _________ (孤独) although she lives alone. She often chats with her friends online.

4. —What's your hobby, Philip? ——I like collecting paintings. Do you _________ (分享) my interest?

5. Every year, many people get hurt or lose their lives in traffic _________ (事故).

6. "You should _____ _____ (上交) your homework before school is over," our teacher said to us.

7. Daniel is raising money to build a new village school. Let's make his dream _____ _____ (实现).

8. I live near my office. So I walk to work_____ _____ (代替) going by car.

9. _____ _____ (多亏) the government's efforts, the city of Longyan is becoming more and more beautiful.

10. We were late for the meeting because the car which we rented _____ _____ (抛锚).

题型:单项选择题

左旋多巴常与卡比多巴合用,因为卡比多巴()

A.有抗胆碱能作用

B.是一种止吐剂

C.有抗组胺作用

D.有多巴胺能作用

E.是一种多巴脱羧酶抑制剂

题型:单项选择题

男性,55岁,患“胃炎”25年,午饭后30分钟突然出现腹部剧烈疼痛并迅速波及全腹。查体:腹式呼吸减弱,腹肌紧张,全腹压痛及反跳痛阳性,尤以上腹部为重,X线检查示膈下游离气体,拟诊为胃十二指肠穿孔。

该病人的处理不正确的是()

A.禁食、输液

B.胃肠减压

C.大剂量抗菌药

D.给予吗啡止痛

E.完善术前准备

题型:单项选择题

依据《建设项目环境保护管理条例》,流域开发、开发区建设、城市新区建设等区域性开发,编制建设规划时,应当编制()。

A.环境影响报告表

B.环境影响报告书

C.环境影响登记表

D.有关环境影响的篇章或说明

题型:单项选择题

西欧中世纪城市法中有关市民身份的规定主要是()

A.市民财产平等

B.商人可成立行会保护自己的利益

C.行会内部取消等级制

D.承认市民享有自由权

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