传统磁铁催化剂中,当Fe2+/Fe3+等于或接近0.5时,催化剂还原后的活性最好。
参考答案:对
对划线部分提问。
1. Her name is Jenny. → her name?
2. I have three pencils. → pencils you have?
3. This is a pencil case. → is this ?
4. This is Danny’s coat. → coat is this?
5.I feel very happy. → you feel?
全静脉麻醉的缺点有()
A.麻醉加深快而容易,呼吸道无刺激
B.多种药物相复合,可取长补短
C.诱导快,病人无痛苦
D.麻醉深度明确且易判定
E.手术室空气无污染