下列各组气体中均能用固体氢氧化钠干燥的一组是[ ] A.H2、O2、HCl B.

题型:选择题

问题:

下列各组气体中均能用固体氢氧化钠干燥的一组是[ ]

A.H2、O2、HCl

B.H2、O2、CO

C.H2、SO2、CO

D.O2、CO、CO2

考点:碱的性质氧气的性质氢气的性质二氧化碳的性质一氧化碳的性质和用途二氧化硫的性质
题型:选择题

死亡保险是指以被保险人的死亡为给付保险金条件的人寿保险。死亡保险又分为()。

A.健康保险和医疗保险

B.意外伤害保险和失能收入损失保险

C.医疗保险和疾病保险

D.定期寿险和终身寿险

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患者,男性,36岁,以“反复左下颌下区进食后肿痛不适半年”为主诉。患者病程中有明显的进食时左侧下颌下区肿胀疼痛,进食后数小时方可逐渐消退。临床查体见患者左下颌下腺导管开口处红肿,轻压腺体导管口溢脓,口内外双合诊于左侧口底近第一磨牙处可触及一黄豆大小硬物。

该患者的治疗方案可考虑

A.临床及实验室检查,若结石较小且位于导管前段,可扪及者可采用保守治疗,或导管取石术。若结石较大,或位于导管后部、腺体内、腺体反复感染、继发慢性硬化性下颌下腺炎、腺体萎缩时则应行腺体切除术。

B.直接手术切除左侧下颌下腺

C.用生理盐水或抗生素液反复冲洗左下颌下腺导管

D.左下颌下腺理疗

E.左下颌下腺切开排脓引流

题型:选择题

Kofi Annan says helping survivors of last week’’s earthquake and (1)________in the Indian Ocean is (2)________. The United Nations secretary-general says countries that have offered aid must (3)________and provide it. The offers add up to around (4)________dollars. United Nations officials say (5) ________of that is needed during the next six months.The concern about offers of international aid is (6)________. For example, the earthquake in Bam, Iran, in (7)________of 2003 killed more than (8) ________people. Countries and groups offered hundreds of millions of dollars (9) ________. The United Nations says it has (10)________only about (11)________dollars in aid received so far. Governments and organizations that offered help (12) ________that, however.On (13)________Mr. Annan met with world leaders in Jakarta, Indonesia to discuss aid for (14)________. The leaders discussed and (15)________the idea of (16)________owed by affected nations. But the leaders did not say they would do so. Some said that (17)________to survivors would be more helpful.Representatives of (18)________countries and international organizations attended the meeting in Jakarta. Officials say they will cooperate to develop (19)________ for the Indian Ocean and the (20)________.

题型:选择题

数字摄像机的主要优点有()。

A.经多次复制后图像质量基本不会下降

B.能够与计算机相连并进行影像处理

C.带有自诊断系统,可检测数字处理中的问题

D.使用高密度记录方式、数据压缩与处理技术等新的技术

题型:选择题

下列选项中,()属于常用仪表校验用标准表。

A、万用表

B、信号发生器

C、电流表

D、交直流稳压电源

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