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【多选题】
下面关于差分系统的描述正确的包括:( )A.
差分系统最大的特点就是降低了监测站与用户站间定位误差的距离相关性。
B.
在大区域内建立WADGPS网，需要的监测站数量较小，投入较小
C.
是一个定位精度均匀分布的系统
D.
覆盖区域可以扩展到LADGPS不易作用的地域
E.
硬件设备及通信工具昂贵，运营费用较高
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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】The policemen were sure the murder was the man _____ gun was found______ beside the dead body.
A.
whose; lying
B.
whose; lay
C.
of whom;lying
D.
of whose; lied
【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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