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【单选题】
Their telephone number is 5675707. Have you ?A.
written it down
B.
written down it
C.
written them down
D.
written down them
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举一反三
【简答题】Clearly if we are to participate in the society in which we live we must communicate with other people . A great deal of communication is performed on a person-to-person basis by the means of s...
【单选题】绿色化学的核心是反应过程的绿色化，即要求原料物质中的所有原子完全被利用且全部转入期望的产品中，下列过程不符合这一思想的是
A.
甲烷、CO合成乙酸乙酯：2CH 4 +2CO CH 3 COOCH 2 CH 3
B.
烯烃与水煤气发生的羰基合成反应：RCH＝CH 2 +CO+H 2 RCH 2 CH 2 CHO
C.
乙醇催化氧化得乙醛
D.
氯乙烯合成聚氯乙烯
【简答题】Clearly if we are to participle in the society in which we live we must communicate with other people. A great deal of communicating is performed on a person-to-person basis by the means of spe...
【单选题】1 Clearly if we are to participate in the society in which we live we must communicate with other people. A great deal of communicating is performed on a person-to-person basis by the simple means of ...
A.
nature
B.
limitation
C.
usefulness
D.
creativity
【单选题】Clearly if we are to participate in the society in which we live must communicate with other people. A great deal of communicating is performed on a person-to-person basis by the simple means of speec...
A.
nature
B.
limitation
C.
usefulness
D.
creativity
【单选题】“绿色化学”的核心是在化学反应过程或化工生产中，尽量减少使用或彻底消除有害物质．下列做法中，符合绿色化学的是（ ）
A.
生产和使用剧毒农药
B.
造纸厂用二氧化硫进行纸浆漂白
C.
利用双氧水制氧气
D.
化工厂产生的废气向高空排放
【简答题】Clearly if we are to participate in the society in which we live, we must communicate with other people. A great deal of communicating is performed on a person-to-person basis by the means of s...
【单选题】绿色化学的核心是反应过程的绿色化，即要求原料物质中的所有原子完全被利用且全部转入期望的产品中，下列过程不符合这一思想的是
A.
氢气、CO合成甲醇： 2H 2 +CO CH 3 OH
B.
烯烃与水煤气发生反应：RCH＝CH 2 +CO+H 2 RCH 2 CH 2 CHO
C.
CH 4 与Cl 2 反应制取CCl 4
D.
氯乙烯合成聚氯乙烯
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