患者，男性，56岁。右手食指末节刺伤后感染出现剧痛，下垂时加重，患指肿胀、发红，伴有

填空。

1. This is the professor _____ taught me chemistry in 1980.

2. The hospital ______ was built five years ago has been modemized.

3. This is the boy _____ father died three years ago.

4. The film_____ we saw the day before yesterday is very interesting.

5. Do you know the student ______was praised at the meeting?

6. 1949 is the year _____ the People's Republic of China was founded.

7. They work in a factory ______makes radio parts.

8. They work in a factory ______ radio parts are made.

9. This is the vision phone through ______  we can see and talk to our friends.

10. Here are players from Japan,some of ______ are our old friends.

把60分解质因数是[ ]

A.60=1×2×2×3×5    

B.60=3×4×5    

C.60=2×2×3×5

质量2kg的质点，在两个力F₁=2N，F₂=8N的作用下，获得的加速度大小可能是（　　）

A．4m/s²

B．6m/s²

C．1m/s²

D．2m/s²

情感

某机电工程安装公司承包本市某化工厂车间的洁净空调工程安装任务。其洁净空调设计等级为N7级，并安装了高效过滤器。为保证工程质量，机电安装公司在风管制作、系统严密性检验、系统调试等关键工作中采取了相应的措施。空调工程在竣工验收后，进行了综合效能测定。由于测定结果均符合设计要求，得到业主的好评。

矩形风管边长不大于（）mm时，不得有纵向接缝。

A．300

B．500

C．600

D．800