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【单选题】
关于培养条件叙述错误的是A.
乳糖比葡萄糖更有利于青霉素的发酵
B.
谷氨酸发酵培养基碳氮比要明显高于一般发酵
C.
抗生素发酵易选用氮源和速效氮源的混合氮源。
D.
对于初级代谢产物，适当提高磷酸盐浓度有利于产物生成
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【单选题】A study shows that to limit TV viewing may _____ stronger relationships between young people, their friends and their parents. [ ]
A.
result in
B.
lie in
C.
take in
D.
lead in
【单选题】It is said that ______ young people may lose their abilities to hear after five years if they listen to MP4 players which are too loud for more than five hours a week. [ ]
A.
thousand of
B.
six thousands
C.
thousands of
【单选题】Violence on TV may turn out to have an ______ on some young people.
A.
effect
B.
efficiency
C.
affect
D.
impression
【单选题】Schools must ensure that most young people ______ the skills and knowledge that may be helpful in their future life. [ ]
A.
acquire
B.
learn
C.
achieve
D.
fulfill
【单选题】The beneficaiary can receive the payment only when_____ .
A.
he has shipped the goods
B.
he has presented the documents
C.
the documents presented comply with he credit terms
D.
the importer has taken delivery of the goods
【简答题】肾输尿管结石的主要表现有______、______、______及其他症状。
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