下列关于物质的性质和用途的说法错误的是 A．氮气用来保护粮食，利用了氮气在常温下

先阅读，再判断。(对的写“T”，错的写“F”。)

     There is a farm near our school. John and I go to the farm today. There are many cows and

sheep there. The cows are white and black. The sheep are white. We like them very much.

( )1. Our school is near the farm.

(     )2. Amy and I go to the farm.

(    )3. We shear the sheep there.

(    )4. The cows are white and black.

(    )5. We like cows and sheep.

领导行为理论主要有（）

A.权变理论

B.管理方格论

C.期望理论

D.领导生命周期

GAAS80焊机不允许用（）方法清洁保养。

A.吸尘器吸除

B.刷子刷除

C.棉纱擦拭

D.压缩空气吹除

设主串长为n，模式串长为m(m≤n)，则在匹配失败的情况下，朴素匹配算法进行的无效位移次数为 (30) 。

A．m

B．n-m

C．n-m+1

D．n