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【多选题】
关于谷氨酸制味精技术,下列说法正确的是A.
谷氨酸的中和是指谷氨酸与碱或碱性盐反应生成谷氨酸钠的过程。
B.
由于铁离子容易氧化变成黄色，对谷氨酸钠的质量有所影响。所以谷氨酸钠产品必须控制铁离子的含量。
C.
常用的脱色方法有活性炭脱色、树脂脱色等。
D.
经过中和、除铁、脱色处理以后，得到较纯的谷氨酸钠溶液。该溶液含有大量的水，需要经过浓缩与结晶，才能得到所需的谷氨酸钠结晶产品。
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举一反三
【单选题】He thought that computers would never be _____ most people.
A.
used by
B.
used for
C.
useful by
D.
use by
【单选题】In 'I hope never to see you from now on', the adverb never is used to modify ______.
A.
the subject
B.
the predicate
C.
the infinitive
D.
the preposition phrase
【单选题】I have never seen the word ______ that way before.
A.
to use
B.
used
C.
using
D.
to be used
【单选题】In 'Educated to be honest, that boy never cheats in the exam', the past participle is used as ______.
A.
an attribute
B.
an adverbial
C.
a complement
D.
an appositive
【单选题】下列各组物质的反应,需要加入酸碱指示剂才能判断反应是否发生的是 ( ) A . Fe 和 CuSO 4 溶液 B . Zn 和稀 H 2 SO 4 C . NaOH 溶液和稀盐酸 D .澄清石灰水和 CO 2
A.
B.
C.
D.
D
【单选题】I never listen to English songs the radio.I listening to MP5.
A.
in ;used to
B.
on;used to
C.
in;am used to
D.
on;am used to
【单选题】Thanks is a common _____ used in English. You can never use it too much.
A.
word
B.
words
C.
expression
D.
expressing
【单选题】Berners-Lee promised that the Website would be never owned by him and would be used by the public freely.
A.
Y
B.
N
C.
NG
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