下列各变化能用质量守恒定律解释的是( ) A.食盐逐渐溶解在水中 B.潮湿的衣服

题型:选择题

问题:

下列各变化能用质量守恒定律解释的是(  )

A.食盐逐渐溶解在水中

B.潮湿的衣服在阳光下晒干

C.空气液化后再蒸发得到气态的氮气和液态氧气

D.蜡烛燃烧后,越来越短,最终消失

考点:质量守恒定律物理变化和化学变化的特征和判别
题型:选择题

阅读短文,判断正(T)误(F)。

      Look! This is my room. There is a big bed in it. Under the bed there is a basketball. On the wall there is a

kite. This is my desk. There are many books on it. Near the desk, there is a closet. I put my beautiful clothes in

it. What's behind the door? Oh, it's Mimi, my naughty cat. I like it very much.

( ) 1. There is a small bed in my room.

( ) 2. Under the bed there is a cat.

( ) 3. The closet is in front of the desk.

( ) 4. I have a kite in my room.

( ) 5. I like my cat.

题型:选择题

已知全集U={-1,1,3},集合A={a+2,a2+2},且CUA={-1},则a的值是(  )

A.-1

B.1

C.3

D.±1

题型:选择题

患者男性,58岁。因上腹隐痛不适伴间断黑便半个月住院。查体:贫血貌,余无重要阳性体征。辅助检查:肝肾动能正常,甲胎蛋白阴性。B超检查提示脾肿大,胰尾脾门部实质性肿块。X线钡餐检查未见明显食管静脉曲张。CT检查提示脾肿大,胰腺尾部肿瘤。数字减影血管造影见脾静脉在脾门部局限性狭窄。

致脾胃区区域性门静脉高压症,引起胃底孤立性静脉曲张的常见疾病有()

A.左肾癌

B.左肾上腺肿瘤

C.胃后壁肿瘤

D.慢性胰腺炎

E.胰腺肿瘤

F.脾脏肿瘤

题型:选择题

选出有错别字的一项(  ) 
A.锻炼、练习、简炼、练达
B.晦气、教诲、广博、脉搏
C.诀别、诀窍、决绝、抉择
D.炮烙、炮制、辨别、辩证

题型:选择题

下列油品中,馏程最高的是()。

A.原油

B.柴油

C.渣油

D.汽油

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