單項選擇題

洗手、消毒：洗手消毒設(shè)施應(yīng)設(shè)置在庫房（）處

A.進(jìn)口處
B．出口處
C．過道處
D．洗手間

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單項選擇題

The selected area electron diffraction (SAED) pattern obtained in a transmission electron microscope (TEM) with electron beam energy of 200 keV and camera length of 2.2.nm×mm shows a diffraction spot

A.08
B.01
C.57
D.57

單項選擇題

冷凍產(chǎn)品的接收溫度在（）攝氏度以下

A.-18
B．-12
C．-15
D．-20

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