下列说法正确的是() A.蛋白质、淀粉、光导纤维、纤维素都是天然高分子化合物 B

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问题:

下列说法正确的是         (  )

A.蛋白质、淀粉、光导纤维、纤维素都是天然高分子化合物

B.麦芽糖属于多糖,能发生水解生成葡萄糖

C.碘酒滴到土豆片上,可观察到土豆片变蓝

D.研究有机物的一般步骤是:分离、提纯→确定化学式→确定实验式→确定结构式

考点:大气污染、改善大气质量水的净化与处理
题型:选择题

阅读理解。

     My friend Eric is a schoolboy. He is an interesting person and everyone likes him very much. He can

speak Chinese, English and Japanese. Why can he speak these languages? Because his father is American, his mother is Japanese and he was born and lives in China.He can play soccer and he can play it very well. He wants to be a soccer ball player like Beckham. He joins the soccer ball club, and he is the captain ( 队长) of the soccer ball team.

根据短文内容,判断正误,正确的用T表示,错误的用F表示。

( )1. Eric can speak three languages.

(     )2. His parents are not Chinese, but he grows up ( 成长) in China.

(     )3. Eric can’t play soccer very well.

(     )4. Eric wants to be the captain of the soccer ball team.

(     )5. Beckham is a good soccer ball player.

题型:选择题

下列操作中无需使用玻璃棒的是(  )

A.溶解

B.过滤

C.分液

D.蒸发

题型:选择题

吸入性肺脓肿的主要表现()

A.毒血症状明显,脓痰可呈蓝绿色

B.起病急、寒战高热、全身衰竭,咳砖红色胶冻样痰

C.吸入病史、高热、腥臭痰,毒血症症状明显

D.起病急、高热寒战、脓血痰、气急,毒血症症状明显,休克

E.急性起病、发热干咳、呼吸困难,白细胞不高或降低

题型:选择题

培土生金法适用于()。

题型:选择题

安全阀应定期校验,至少()年校验一次。

A.1

B.2

C.3

D.4

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