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【单选题】
新加坡航空公司、瑞士航空公司和美国三角洲航空公司合作,研制共同的订票系统和维护系统,统筹安排营运时间,建立统一的行李运输等地勤服务制度,通过对核心资源的共享,大大降低了各航空公司的运营成本,提高了工作效率。这是()的成功运用。A.
市场营销观念
B.
关系营销观念
C.
社会市场营销观念
D.
绿色营销观念
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【多选题】How does tubulin polymerize from nucleation sites on a centrosome?
A.
Inside cells, microtubules grow from specialized organizing centers that control the location, number, and orientation of the microtubules.
B.
In most animal cells, for example, the centrosome—which is typically close to the cell nucleus when the cell is not in mitosis—organizes an array of microtubules that radiates outward through the cytoplasm. The centrosome consists of a pair of centrioles, surrounded by a matrix of proteins.
C.
The centrosome matrix includes hundreds of ringshaped structures formed from a special type of tubulin called γ-tubulin, and each γ-tubulin ring complex serves as the starting point, or nucleation site, for the growth of one microtubule.
D.
The αβ-tubulin dimers add to each γ-tubulin ring complex in a specific orientation, with the result that the minus end of each microtubule is embedded in the centrosome, and growth occurs only at the plus end that extends into the cytoplasm.
【简答题】Distinguish between homogeneous and heterogeneous nucleation for the solidification of a pure metal.
【简答题】信息技术是一个综合的技术，()已成为支持信息技术的核心技术。 A)计算机与智能技术 B)传感技术 C)IP技术 D)网络技术
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