单项选择题

搜索引擎优化的缩写是（）

A.SEO
B.PV
C.PPC
D.UV

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不定项选择

主视图投影方向与轴线垂直。

A．正确
B．错误

多项选择题

If a significant fraction of heavy components is present in the natural gas mixture, laboratory measurements of ( ) of the C7+ fraction are required to use mixing rules.

A．the molecular weight
B．mole fraction
C．gravity
D．critical temperature
E．critical pressure