若代数式-2a3bm与3an+1b4是同类项，则mn=______．

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问题填空题

若代数式-2a³b^m与3aⁿ⁺¹b⁴是同类项，则mn=______．

答案

∵-2a³b^m与3aⁿ⁺¹b⁴是同类项，

∴n+1=3，m=4，

解得n=2，m=4，

∴mn=8．

故答案为：8．

句型转换

句型转换。

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______ is the People's Hospital ?

2. They each speak a foreign language. (同义句)

______ them ______ a foreign language.

3. The house has a garden behind it. I like it. (同义句)

I like the house ______ behind it.

4. The hairdresser is next to the restaurant. (对画线部分提问)

______ hairdresser ?

5. "Where do you work?" Mr. Smith asks me. (合为一句)

Mr. Smith asks me where ______.

单项选择题

女性，65岁，因胃癌入院，准备行胃大部切除术。患者曾有输血过敏史，现准备术中用血时，最好选用

A．输全血

B．输浓缩红细胞

C．洗涤红细胞

D．少白细胞的红细胞

E．血浆