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【单选题】
氧气是生命活动的必需气体。下列关于氧气的性质、制备说法正确的是
A.
保持氧气化学性质的最小粒子是氧分子
B.
可用向下排空气法或排水法收集氧气
C.
铁丝在氧气中剧烈燃烧，生成 Fe 2 O 3
D.
利用如图装置可比较 MnO 2 和 CuO 对 H 2 O 2 分解的影响
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【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified
B.
have usually left some traces
C.
can usually be reconstructed
D.
have always vanished without any trace
查看完整题目与答案
【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified
B.
have usually left some traces
C.
can usually be reconstructed
D.
have always vanished without any trace
查看完整题目与答案
【简答题】课内阅读: 登上万寿山,站在佛香阁的前面向下望,颐和园的景色大半收在眼底。葱郁的树丛,掩映着黄的绿的琉璃瓦屋顶和朱红的宫墙。正前面, 昆明湖静得像一面镜子, 绿得像一块碧玉。 游船、画舫在湖面慢慢地滑过,几乎不留一点儿痕迹。向东远眺,隐隐约约可以望见几座古老的城楼和城里的白塔。 1. 短文中描写颜色的词有哪些? ________ ________ ________ ________ 2. 文中画 ...
查看完整题目与答案
【单选题】安全标志用色中绿色的含义是（）。
A.
停止，禁止，高度危险
B.
指令，必须遵守的规定
C.
提示，安全状态，正常通行
D.
警示，注意，小心行动
查看完整题目与答案
【判断题】安全标示牌中的绿色表示的是指令标志。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】建筑安全标志中用于表示指令的颜色是( )
A.
红色
B.
黄色
C.
蓝色
D.
绿色
查看完整题目与答案
【判断题】作者登上万寿山,站在佛香阁的前面,向东远眺看到的是朱红的宫墙。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】关于原发性肺结核病的描述,下列哪一项是正确的?
A.
常见的死亡原因为结核性脑膜炎
B.
病变在肺内易沿支气管播散
C.
咯血是常见的死亡原因之一
D.
仅发生于儿童
E.
如不经过积极治疗难于痊愈
查看完整题目与答案
【判断题】安全标志中绿色的是指示标志。
A.
正确
B.
错误
查看完整题目与答案
【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified.
B.
have usually left some traces.
C.
can usually be reconstructed.
D.
have always vanished without any trace.
查看完整题目与答案
相关题目：
【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified
B.
have usually left some traces
C.
can usually be reconstructed
D.
have always vanished without any trace
查看完整题目与答案
【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified
B.
have usually left some traces
C.
can usually be reconstructed
D.
have always vanished without any trace
查看完整题目与答案
【简答题】课内阅读: 登上万寿山,站在佛香阁的前面向下望,颐和园的景色大半收在眼底。葱郁的树丛,掩映着黄的绿的琉璃瓦屋顶和朱红的宫墙。正前面, 昆明湖静得像一面镜子, 绿得像一块碧玉。 游船、画舫在湖面慢慢地滑过,几乎不留一点儿痕迹。向东远眺,隐隐约约可以望见几座古老的城楼和城里的白塔。 1. 短文中描写颜色的词有哪些? ________ ________ ________ ________ 2. 文中画 ...
查看完整题目与答案
【单选题】安全标志用色中绿色的含义是（）。
A.
停止，禁止，高度危险
B.
指令，必须遵守的规定
C.
提示，安全状态，正常通行
D.
警示，注意，小心行动
查看完整题目与答案
【判断题】安全标示牌中的绿色表示的是指令标志。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】建筑安全标志中用于表示指令的颜色是( )
A.
红色
B.
黄色
C.
蓝色
D.
绿色
查看完整题目与答案
【判断题】作者登上万寿山,站在佛香阁的前面,向东远眺看到的是朱红的宫墙。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】关于原发性肺结核病的描述,下列哪一项是正确的?
A.
常见的死亡原因为结核性脑膜炎
B.
病变在肺内易沿支气管播散
C.
咯血是常见的死亡原因之一
D.
仅发生于儿童
E.
如不经过积极治疗难于痊愈
查看完整题目与答案
【判断题】安全标志中绿色的是指示标志。
A.
正确
B.
错误
查看完整题目与答案
【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified.
B.
have usually left some traces.
C.
can usually be reconstructed.
D.
have always vanished without any trace.
查看完整题目与答案