单项选择题

某个照相机的标准镜头的焦距为80mm,这个照相机属于（  ）。 ‌
‌
‏‌

A．135照相机
B．单反照相机
C．大型照相机
D．120照相机
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单项选择题
What is the main reason that the Golden Gate Bridge is entitled as a world wonder? Choose the most appropriate reason. A、Because it is a suspension bridge B、Because it is the seventh longest one in the world. C、Because it is the second longest one in the world. D、Because such a long suspension bridge was built in 1930s when the technology was quite limited.
单项选择题
The higher the Km value of the enzyme, the lower the affinity to substrate.
A．对
B．错
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