更多"“Must I come at four o’clock” “Oh n"的相关试题:
[单项选择]-- It's 10 o'clock now. I must go.-- It's raining outside. Don't leave______ it stops.
[单项选择]"Do you think he will come tonight " "Oh, yes. It's ______ that he will."
A. almost surely
B. near positive
C. very likely
D. quite certainly
[单项选择]Most visitors come to Cambridge to study in the colleges in Cambridge.
[单项选择]Come on, Peter. I want to show you something.
Oh, how nice of you. I（）you（）to bring me a gift.
A. never think, are going
B. never thought, were going
C. didn't think, were going
D. hadn't thought, were going
[单项选择]Helena: Oh, welcome, come in, please. Jack: ______ And here's a small gift. Let me wish you happy every day. Helena: Thank you. Oh, what a beautiful birthday card!
[单项选择]"Come on, Peter. I want to show you something.""Oh, how nice of you. I ______ you ______ to bring me a gift."
[单项选择]Of the following four types of music, ______ is considered the native American music.
A. rock and roll
B. jazz
C. classical music
D. western and country music
[单项选择]1-OH蒽醌的IR光谱中，υCO峰的特征是（）
A. 1675～1621cm-1处有一强峰
B. 1678～1661cm-1和1626～1616cm-1处有两个吸收峰
C. 1675～1647cm-1和1637～1621cm-1处有两个吸收峰
D. 1625cm-1和1580cm-1处有两个吸收峰
E. 1580cm-1处有一个吸收峰
[填空题]配合物[Co（NH3）6]2+、[Co（H2O）6]2+（两者均为Oh对称）和[CoCl4]2-的溶液具有三种不同的颜色（粉红色、黄色和蓝色），根据光谱化学序列和△t或△o的大小确定上述化合物的颜色依次为（）、（）和（）。
[单项选择].将一块严重腐蚀而部分变成铜绿［化学式为Cu2(OH)2CO3］的铜块磨成粉末，在空气中充分灼烧成CuO，发现固体质量在灼烧前后保持不变，则灼烧前粉末中铜(单质)的质量分数为（ ）。
A. 52.8%
B. 50.0%
C. 47.2%
D. 46.3%
[填空题]甲醇合成的反应方程式为CO+2H2== CH3OH + Q，该反应为（）反应。
[简答题] 估算配合物中唯自旋对磁矩的贡献： （1）[Co（NH3）6]3+ （2）[Fe（OH2）6]2+ （3）[Fe（CN）6]3- （4）[Cr（NH3）6]3+ （5）[W（CO）6] （6）四面体[FeCl4]2- （7）四面体[Ni（CO）4]。
[单项选择]理想气体反应CO（g）+2H2（g）=CH3OH（g）的ΔrGmθ与温度T的关系为：ΔrGmθ=-21660+52.92T，若要使反应的平衡常数K>1，则应控制的反应温度：（）
A. 必须低于409.3℃
B. 必须高于409.3K
C. 必须低于409.3K
D. 必须等于409.3K
[单项选择]在标准状态下，反应C2H5OH（l）+3O2（g） →2CO2（g）+3H2O（g）的反应焓为ΔrHmθ，ΔCp>0， 下列说法中正确的是（）
A. ΔrHmθ是C2H5OH（l）的标准摩尔燃烧焓
B. ΔrHmθ〈0
C. ΔrHmθ＝ΔrUmθ
D. ΔrHmθ不随温度变化而变化
[判断题]测定Fe（OH）3溶胶的ζ-电位，在制备Fe（OH）3溶胶时，Fe（OH）3溶液的用量不必准确汲取。
[单项选择]可用于鉴别3-OH和5-OH黄酮的是( )
A. 氨性氯化锶
B. 四氢硼钠
C. 二氯氧锆
D. Molish反应
E. 醋酸镁
