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光电效应所造成的消耗即为真吸收。

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X射线的波长在约范围内，用于衍射分析的X射线波长范围为。

X射线的产生条件：①。②。③。

Part II··Structure ··（10 minutes)Directions: This part is to test your ability to construct grammatically correct sentences. It consists of2 sections.Section A21. While______________ a survey on smartphone use,the marketing manager found that most people she talkedto had a Huawei.

A)conduct
B) conducted
C)conducting
D) to conduct

22. Executives should have a better idea of what they need and___________they can afford to hire new teammembers.

A)that
B)which
C)whether
D)what