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【单选题】
根据客梯清洁要求，以下对服务员在清洁电梯的操作标准，理解正确的是哪项（）？A.
保持电梯四壁、地面清洁，无烟头，纸屑杂物或等
B.
发现梯内有污迹随时清扫干净，注意在客人较少时清洁。
C.
每天一次清洁时，需吸干净电梯内墙边角处及电梯门轨处的沙尘。
D.
所有选项皆对
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皮皮学刷刷变学霸
举一反三
【单选题】Which statement best describes the relationship between genotype and phenotype?
A.
'Genotype' and 'phenotype' both describe the physical properties of cells and organisms, just using different words or symbols.
B.
Phenotype is entirely the consequence of a cell's genotype, which is why we now recognize the principle of 'genetic determinism.
C.
The genes found in a cell are that cell's genotype, and genes directly control a cell's phenotype.
D.
The genotype determines what proteins a cell contains, and the proteins in turn determine the cell's properties, or phenotype.
【单选题】In maternal effect, the phenotype of offspring depends on
A.
Its own genotype
B.
Mother’s genotype
C.
Father’s genotype
D.
Mother’s phenotype
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