若轧辊圆周速度V＝3m/s，轧件入辊速度VH＝2.25m/s，延伸系数μ＝1.5，计

产后小便不通，多发生在产后()

A.2小时后

B.4小时后

C.6小时后

D.8小时后

E.10小时后

句型转换：

1. I have already finished my homework. (否定句)

    I ________ finished my homework _________.

2. Les's go swimming this afternoon, _________ _________(改为反意疑问句).

3. We plant many trees every year.(改为被动语态)

    Many trees _________ _________ by us every year.

4. She has to walk to school every day. (改为一般疑问句) 

    _________ she _________ to work to school every day?

5. It's very wet and cold today. (就划线部分提问) 

   _________ the weather _________ today?

男，51岁，有结核病接触史，吸烟30余年，无自觉症状。体检时胸片发现左上肺于第2前肋间近外侧胸壁处有直径约3cm的肿块阴影，边缘较模糊，痰液检查未发现癌细胞，痰液检查未发现癌细胞，亦未找到抗酸杆菌，支纤镜检阴性。

因设备条件原因，病人的诊断仍未能最后确定，宜建议采取的最好治疗选择是（）。

A.抗结核治疗

B.抗肿瘤放疗

C.抗肿瘤化疗

D.随诊观察，定期复查

E.剖胸探查手术

在盐酸与锌的反应中,盐酸是做氧化剂。