根据()可判断氨合成催化剂的还原程度。
A.床层温度
B.实际出水量
C.氨水浓度
D.合成塔出口气体成分
参考答案:B
用适当的介词或副词填空。
up high down on to with
1. Jack is a strong (强壮的) boy. He can jump ____.
2. Lift ____ your left leg.
3.I often go to school ____ foot.
4. Can you play chess ____ me?
5. We are trying ____ follow the old man's orders.
6. Bend ____.
关于宫颈上皮内瘤变的论述正确的是()
A.与HPV感染相关
B.是一种慢性炎症,可以不治疗
C.异型细胞起始于基底膜以上
D.不可能发展为癌
E.中度不典型增生,指病变局限于上皮的2/3