在托盘天平两端各放一只烧杯,调节至平衡。在两只烧杯里各加入等质量、等质量分数的稀

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问题:

在托盘天平两端各放一只烧杯,调节至平衡。在两只烧杯里各加入等质量、等质量分数的稀盐酸,然后向左右两烧杯中分别放入质量相等的镁和铝,待充分反应后,镁有剩余,则还可以观察到的现象是          (    )

①天平保持平衡                   ②铝也有剩余  

③天平指针偏向放镁的一方         ④天平指针偏向放铝的一方

A.只有①

B.①和②

C.②和④

D.只有③

考点:金属的化学性质S,Fe,C,P等物质在氧气中的燃烧二氧化碳的性质实验金属活动性
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短文改错(共10 小题;每小题1分,满分10分)

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的一篇作文。文中共有10 处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(^),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下面画一横线,并在该词下面写出修改后的词。

注意:

1.     每处错误及其修改均仅限一词。

2.     只允许修改10处,多者(从11 处起)不计分。

This morning Wang Hua and I went school on foot together. In the way Wang Hua saw Li Lin riding a bike on the other side of the street. He was too anxious to join Li Lin that he left me in a hurry and ran across the street in the front of a car. Luckily the driver stopped his car quickly.  What dangerous! Wang Hua jumped onto Li Lin’s bike but they went on. But when they come to the school gate , they were knocked down by a car. We were both injured and sent to hospital immediately. Fortunately, they escaped being killed. We should draw a lesson from this accident and strict obey the traffic rule in everyday life.

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位数和数位的意义一样。[ ]

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肾病综合征适用()

A.糖皮质激素

B.环磷酰胺

C.肝素

D.消炎痛

E.抗生素

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不属于悬吊式顶棚的类别是()。

A、直接式

B、活动式

C、整体式

D、单体式

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采用拨号入网的用户的必备设备是()

A.CD-ROM

B.鼠标

C.电话机

D.Modem

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