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【单选题】
Smoking is considered dangerous to the health: Our tobacco-seller Mr. Johnson, therefore, always asks his customers, if they are very young , whom the cigarettes are bought【C1】______. One day, a little girl whom he had never seen before walked【C2】______into his shop and demanded twenty cigarettes. She had the【C3】______amount of money in her hand and seemed very【C4】______of herself. Mr. Johnson was so【C5】______by her confident manner that he【C6】______to ask his usual question.【C7】______, he asked her what kind of cigarettes she wanted. The girl replied【C8】______and hand with the money. While he was giving her the【C9】______, Mr. Johnson said laughingly that【C10】______she was so young she should【C11】______the packet in her pocket in【C12】______a policeman saw it.【C13】______the little girl did not seem to find this very funny. Without【C14】______smiling she took the【C15】______and walked towards the door. Suddenly she stopped, turned【C16】______, and looked steadily at Mr. Johnson. There was a moment of silence and the tobacco-seller【C17】______what she was going to say.【C18】______at once, in a clear,【C19】______voice, the girl declared, 'My dad is a police-man', and with【C20】______she walked quickly out of the shop. 【C1】
A.
with
B.
to
C.
for
D.
by
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【单选题】铁碳合金相图上的PSK线,其代号用____表示:
A.
A 1
B.
A 3
C.
A cm
【单选题】关于分批培养不正确的是( )
A.
细胞生长在固定培养基中,直至培养基中是养分为细胞耗尽为止
B.
用适当搅拌的方法增加和维持游离的细胞团在培养基中的均匀分布
C.
在成批培养的整个过程中,细胞数目会发生不断变化,呈现出从培养基开始起到,细胞增殖停止为止的细胞生长周期
D.
分批培养方法局限于实验规模
【单选题】在哪个时期,染色体数目减半
A.
生长期
B.
增殖期
C.
成熟期
D.
变形期
【单选题】铁碳合金相图上的 PSK线,其代号用( )表示。
A.
A1
B.
A3
C.
Ac1
D.
Acm
【单选题】某轮由44°N起沿子午线向南航行,计程仪读数差为240',△L=0%,不考虑外界影响和航行误差等,则到达点的纬度 。
A.
等于40°N
B.
大于40°N
C.
小于40°N
【单选题】煎膏剂炼糖时加入少量的枸橼酸或酒石酸的主要目的是
A.
促进蔗糖转化
B.
控制糖的转化率
C.
抑制酶的活性
D.
调整pH值
E.
增加糖的溶解度
【判断题】一个非零的整数系多项式能够分解成两个次数较低的有理数多项式乘积。()
A.
正确
B.
错误
【单选题】中规模异步计数器 74LS290共有 种计数进制。
A.
1
B.
2
C.
3
D.
5
【判断题】一个非零的整数系多项式能够分解成两个次数较低的整系数多项式乘积。()
A.
正确
B.
错误
【单选题】某轮由44°N起沿子午线向南航行,计程仪读数差为240',△L=0%,不考虑外界影响和航行误差等,则到达点的纬度 。
A.
等于40°N
B.
大于40°N
C.
小于40°N
D.
无法确定
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