多项选择题

Sampling of liquid samples requires the following steps？（）

A．shake well
B．surface disinfection
C．opening with sterile tools
D．pipette samples below 2.5cm from the liquid surface

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单项选择题

通过下面的代码片段来回答问题。设置 logoImageView 在 view 左边 8 个单位处，下列操作正确的是？ A、 B、 C、 D、

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