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【单选题】
下列硝化试剂与苯发生硝化时以 NO + 为亲电质点进攻苯环,发生亲电取代的是 ( ) 。A.
浓硝酸
B.
稀硝酸
C.
混酸
D.
浓硫酸
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举一反三
【单选题】Mariners are FIRST warned of serious defects or important changes to aids to navigation by means of ______.
A.
marine broadcast Notice to Mariners
B.
Weekly Notices to Mariners
C.
corrected editions of charts
D.
Light Lists
【简答题】在完全竞争市场上,生产要素的需求曲线向右下方倾斜是由于( )A. 要素生产的产品的边际效用递减； B. 要素的边际产品递减； C. 投入越多，产出越大，从而产品价格越低 D. 要素所生产的产品的需求减少
【单选题】Which is a weekly publication advising mariners of important matters affecting navigational Safety ?
A.
Light List
B.
Notice to Mariners
C.
Coast Pilot
D.
Sailing Directions
【单选题】Section III of admiralty Notice to Mariners weekly edition is____.
A.
Explanatory Notes，Publication List
B.
Admiralty Notices to Mariners. Updates to Standard Nautical Charts
C.
Reprints of Radio Navigational Warnings
D.
Amendments to Admiralty Sailing Directions
【单选题】【单选】Mariners are FIRST warned of serious defects or important changes to aids to navigation by means of ______.
A.
marine broadcast Notice to Mariners
B.
Weekly Notices to Mariners
C.
corrected editions of charts
D.
Light Lists
【简答题】在完全竞争市场上,生产要素的需求曲线向右下方倾斜是由于( )(5.0分)A. 要素生产的产品的边际效用递减； B. 要素的边际产品递减； C. 投入越多，产出越大，从而产品价格越低 D. 要素所生产的产品的需求减少
【单选题】The information in ( ) is intended primarily for use by mariners in vessels of 150 GT or more.
A.
Notice to Mariners
B.
Mariners' Handbook
C.
Sailing Directions
D.
Guide to Port Entry
【单选题】—I thought you were proud of the work I . —I’m afraid not .You’d better change it for another.
A.
do
B.
had done
C.
did
D.
would
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