回归分析中b＜0，经检验P＜0.01，则可认为能作相关分析的两变量呈负相关。
参考答案：对
改错。
1. — What's this in English?
A B
— It's ruler.
C D
2. — Is this a desk? — Yes, it isn't.
A B C D
3. — Is that your dictionary? — Yes, it's.
4. — And what's this?
A B C
— This is a pencil sharpener.
D
水泥灌浆的施工工序有（）。
A、钻孔
B、冲刷
C、埋管
D、灌注
