用下列实验装置完成对应的实验(部分仪器略去),能达到实验目的的是() ABCD制

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问题:

用下列实验装置完成对应的实验(部分仪器略去),能达到实验目的的是(   )

ABCD
制取乙酸乙酯检查装置的气密性定量测定 H2O2的分解速率证明 CH3CH2OH 发生消去反应生成了乙烯

考点:设计实验方案及探究实验
题型:选择题

败血症()

A.紫癜伴发热

B.紫癜伴黄疸

C.紫癜伴肝脾淋巴结肿大

D.紫癜伴休克

E.双下肢对称性紫癜伴荨麻疹

题型:选择题

《大气污染物排放标准》(GB 16297—1996)中规定,若某排气筒的排放为间断性排放,排放时间小于1 h,应在排放时段内实行连续采样,或在排放时段内以等时间间隔采集( )个样品,并计平均值。

A.1~2

B.2~3

C.2~4

D.3~4

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完成句子

1. Tom hid himself behind the door ,________________( 从那里他可以听到)the steps of his mother

    clearly.(hear)

2. ________________( 很多人没有意识到的) of is that providing the best education possible is very

   important for their children's future. (aware)

3. On top of the mountain __________( 有一座古老的庙宇) ,which attracts a lot of visitors.(stand )

4. The reason ________________( 他们放弃了) the search on a large scale was that the lost child

     had little chance of survival.(abandon)

5. "Are you on the strength here?""No,______________(我只不过是帮忙)for a week."(help)

6. ________________(整理)all the picture postcards I've collected over the past 25 years is quite a

    job.(sort)

7. To our surprise,the stadium, ________________(竣工于1964年),is still in good state.(complete)

8. With many of his works __________(被出版),he became more and more famous.(come)

9. Nothing in the room is in a mess,so I think they __________(不可能搜查过) it.(search)

10. Over the last six years I've had time to reflect on the extraordinary events __________(我亲眼

      目睹的). (winess)

题型:选择题

关于关税的特点,下列说法正确的是()。

A.关税是多环节征税

B.关税主要是对出口货物征税

C.关税只对进口货物和物品征税

D.关税的征税对象是进出境的货物和物品

题型:选择题

可作为栓剂制备用基质的是()

A.聚乙二醇

B.液状石蜡

C.凡士林

D.甘油

E.羊毛脂

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