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【简答题】
空气重度污染 煤炭是空气污染的最大来源,而中国 80% 的电能和 70% 的能源总量来自于煤炭。每天,为了给工厂提供动力,为家庭供暖,为做饭提供燃料,大约要燃烧 600 万吨煤。增长的私家车数量,密集的交通流量以及低标准的汽油已经使汽车成为中国大城市空气污染的罪魁祸首。中国严重的空气污染状况在很大程度上使其突出经济成就失色不少。
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皮皮学刷刷变学霸
举一反三
【单选题】The policemen_______the stolen place again and again,and finally they found the evidence who stol
A.
24.The policemen_______the stolen place again and again,and finally they found the evidence who stole the antique(古董). A.got through
B.
picked up
C.
went over
D.
turned over
【单选题】The policemen were sure that the murderer was the man _____ gun was found lying beside the dead body.
A.
who had
B.
whose
C.
which
D.
of whom a
【简答题】The criminal found a shelter. Very soon, he was caught by the policemen. (no sooner ...than }
【单选题】傅 — 克烷基化反应易发生碳正离子的重排,为了得到正烷基苯,可行的办法是:
A.
使用 AlCl 3 作催化剂
B.
使反应在较高温度下进行
C.
通过酰基化反应,之后还原
D.
使用硝基苯作溶剂
【简答题】Exercise 2. Identify the sentence-linking words and write them on the underlines in the order as they are presented in the passage. Synonyms, words that have the same basic meaning, do not always have...
【单选题】傅-克烷基化反应易发生重排,为了得到正烷基苯,最可靠的方法是:( )
A.
使用三氯化铝作为催化剂
B.
反应在较高温度下进行
C.
通过酰基化反应,再还原
D.
使用硝基苯作溶剂
【单选题】傅克烷基化反应易发生重排,为了得到正烷基苯,最可靠的方法是:
A.
使用AlCl 3 作催化剂
B.
使反应在较高温度下进行
C.
通过酰基化反应,再还原
D.
使用硝基苯作溶剂
【单选题】耐高温、耐高压、耐湿的物品首选的是 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
压力蒸汽灭菌 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
B.
煮沸消毒法
C.
燃烧法 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
D.
干烤法
E.
电离辐射灭菌法
【判断题】Do synonyms always have the same connotations?‍
A.
正确
B.
错误
【简答题】Ex. 6 Rewrite the following sentences, replacing the underlined words with their synonyms you have learned in this unit. 1. Most of this year’s graduates of our university have found jobs . 2. Y...
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