下列有关甲苯的实验事实中，能说明苯环对侧链性质产生影响的是（_爱下问搜题

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问题选择题

下列有关甲苯的实验事实中，能说明苯环对侧链性质产生影响的是（）

A．甲苯燃烧产生带浓烟的火焰

B．甲苯能使酸性KMnO₄溶液褪色

C．Cl₂既能取代甲苯中苯环上的氢原子，也能取代甲基上的氢原子

D．甲苯能与H₂发生加成反应

答案

答案：B

阅读理解

Read and write.

Mary
Height: 150 cm
Weight: 41 kg
Age: 11 years old

Rick
Height: 148 cm
Weight: 40 kg
Age: 10 years old

Bob
Height: 157 cm
Weight: 43 kg
Age: 12 years old

1. Mary is _     _ than Rick. But Bob is          .
2. Mary is _     _ than Rick. But Bob is          .
3. Mary is _     _ than Rick. But Bob is        _.
4. Bob is            than Mary, and he is          .

问答题简答题

压力容器焊接缺陷一般有哪些？