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【单选题】
关于缓冲溶液去酸，正确的说法是( )A.
对缓冲溶液进行少量稀释，会改变其pH值
B.
缓冲溶液通常由3～4种物质组成
C.
缓冲溶液既能抵制外加的少量强酸，也能抵制外加的少量强碱
D.
档案去酸时应选择pH值为5～6的缓冲溶液
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【单选题】Which of the following sentences is INCORRECT?
A.
The iron and steel industry are very important to our life.
B.
Either you or she is to go.
C.
He as well as I wants to go boating
D.
Each of us has a tape-recorder.
【简答题】Either he or I ____ to attend the mass meeting this evening.(be) 52. ____ either he or I to attend the mass meeting this evening. 53. An iron and steel works, with some satellite factories, ____ to be...
【简答题】The cylinder head is usually cast in one piece from iron, from iron alloyed with other metals, or from aluminum alloy. Aluminum has the advantage of combining lightness with high heat conductivity .th...
【单选题】La médecine a fait d 'immenses progrès, en Chine comme en France.
A.
énormes
B.
étonnants
C.
étrangers
D.
(de) modestes
【单选题】En décembre 2018, la Chine compte combien d'internautes mobiles selon le recensement?
A.
82 851 000.
B.
816 980 000.
C.
828 510 000.
D.
Le chiffre n'est pas mentionné.
【单选题】En 1949, la Chine (déclarer) ___________la guerre au Japon.
A.
d é clarait
B.
d é clare
C.
a d é clar é
D.
vient de d é clarer
【单选题】Le Maroc a établi la relation diplomatique avec Chine en ________.
A.
1958
B.
1986
C.
1985
D.
1965
【简答题】Chine: les exportations remontent en mai ______ la guerre commerciale.
【简答题】On a fondé la Chine en 1949.
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