根据反应X2+2HY=2HX+Y2,X2+2HZ=2HX+Z2,Z2+2HY=2

题型:选择题

问题:

根据反应X2+2HY=2HX+Y2,X2+2HZ=2HX+Z2,Z2+2HY=2HZ+Y2,下列叙述中错误的是(  )

A.物质氧化性:X2>Z2>Y2

B.物质的还原性:HY>HZ>HX

C.反应Y2+2HX=2HY+X2也能发生

D.Z2可能有氧化性,也可能有还原性

考点:氧化性、还原性强弱的比较
题型:选择题

阅读理解。

     One day, a little bear(熊) goes to buy something in Grandpa Hare's shop. There are many things in

the shop. The little bear sees some bottles of honey(蜂蜜) and many apples on the shelf(架子). The little

bear asks, "How much is a bottle of honey?" Grandpa Hare says, "It's four yuan." The little bear asks,

"What about the apples?" "It's fifty fen each." Grandpa Hare says. The little bear asks, "I'd like two

bottles of honey and five apples. How much are all these things?" Grandpa Hare says, "Ten yuan, please."

1. The shopkeeper(店员) is a ______.

A. hare

B. horse

C. bear

2. Three bottles of honey are ______yuan.

A. 4

B. 6

C. 12

3. Six apples are ______yuan.

A. 0.5

B. 5

C. 3

4. Grandpa Hare asks the little bear for ______yuan.

A. 8

B. 10

C. 16

5. The shopkeeper makes a mistake(出错). In fact (实际上), the little bear must pay(付)

    _____ for the things.

A. ⊥10.50

B. ⊥11.00

C. ⊥14.50

题型:选择题

如图所示,将完全相同的两小球A、B用长L=0.8m的细绳,悬于以向右匀速运动的小车顶部,两球与小车前后壁接触。由于某种原因,小车突然停止,此时悬线中张力之比

A.1:1

B.1:2

C.1:3

D.1:4

题型:选择题

必要时需做皮肤过敏试验的局麻药是

A.丁卡因
B.布比卡因
C.利多卡因
D.普鲁卡因
E.托吡卡胺

题型:选择题

我国理论工作者和评估人员通常认为较为合适的专利的利润分成区间为()

A、1O%~20%

B、20%~25%

C、25%~33%

D、33%~50%

题型:选择题

卡双封属于分层压裂工艺措施。()

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