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【单选题】
在“观察DNA和RNA在细胞中的分布”实验中,下列说法正确的是( )A.
染色用甲基绿染液,再用吡罗红染液
B.
用8%的盐酸的目的之一是使DNA与蛋白质分离,使DNA水解
C.
酒精灯烘干载玻片,可迅速杀死细胞,防止细胞死亡时溶酶体对核酸的破坏
D.
用高倍显微镜可以比较清楚地看到呈绿色的细胞质和呈红色的细胞核
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【单选题】Which of the following is the suggestion of the interviewer to the problem?
A.
The government should spend more money helping innovation.
B.
The kids should cultivate their love of science and invention.
C.
More inventor's clubs should be set up.
D.
Invention courses are necessary to children.
【单选题】It is often difficult for a man to be quite sure what tax he ought to pay to the government because it depends on so many different things: whether the man is married how many children he has whether ...
A.
how much education one has received
B.
whether one is single or married
C.
how old one's children are
D.
where one lives
【简答题】下列哪一项不是进入一个垄断行业的壁垒( )。 A) 垄断利润 B) 政府特许经营权 C) 专利权 D) 资源控制
【单选题】下列合同中能够依法变更的是( )
A.
以胁迫方式订立的损害国家利益的合同
B.
因乘人之危订立而被当事人撤销的合同
C.
无权处分而又未获权利人追认的效力未定合同
D.
依法生效的合同
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