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【单选题】
已知 298K 标准态下,下列反应自发正: Cu + 2Fe 3+ = Cu 2+ +2Fe 2+ , Cu 2+ + Fe = Cu +2Fe 2+ , 则反应物中最强的氧化剂和最强的还原剂分别是( )。A.
Cu 2+ , Fe
B.
Fe 3+ ， Fe
C.
Fe 3+ ， Cu
D.
Cu 2+ , Cu
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【简答题】三、产品规则 系列产品 BOM结构图 三、产品研发 名称 开发费 开发时间 加工费 直接成本 产品组成 P1 1M/季 2季 1M 2M R1*1 P2 1M/季 3季 1M 3M R2*1 R3*1 P3 1M/季 4季 1M 4M R1*1 R3*1 R4*1 P4 1M/季 5季 1M 5M R2*2 R3*1 R4*1 2 . 生产2个P2需要什么原材料 ?
【单选题】下列关于指示剂的论述，错误的是（）
A.
指示剂的变色范围越窄越好
B.
指示剂的用量应适当
C.
指示剂的变色范围应恰好在突跃范围内
D.
指示剂的理论变色点是pH=pK HIn ±1
【简答题】I should like to see ___________ you live, Jon. 我想去看看你住的地方,乔恩。
【多选题】根据对话情景选择恰当的选项,其中有两项是多余的。
A.
Are you feeling better?
B.
You should go to see the doctor.
C.
I’m afraid of taking medicine. It tastes terrible.
D.
I’m afraid of catching bad diseases.
E.
I would like to go home.
F.
Follow the doctor’s advice and you’ll get well soon.
G.
You shouldn’t see a doctor. Peter: Hello, John. This is Peter speaking. John: Hello. You sound sad. I heard you had a bad cold. 11 Peter: No. I’m feeling much worse. 12 It makes me so tense. Do you think I’m going to die? John: No, Peter. Calm down and take more exercise. You just had the flu. 13 Peter: But I hate to go to the hospital. 14 John: Don’t be afraid! You are the bravest boy. 15 Peter: Thanks, John.
【简答题】I wonder whether there is any girl or boy who does not like to see a rainbow in the sky. It is so beautiful. There is a story, saying that whenever you see a rainbow you should run at once to the plac...
【简答题】举例说明特种陶瓷的主要用途。
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