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【单选题】
When transferring solution with a pipet, the correct operation to release solution isA.
The pipet is inserted into the receiving container and removed as soon as the solution flows out naturally
B.
The pipet is vertical and the pipet tip is against the inner wall of the receiving container. After the solution flows out naturally, stop at least 30s and then move away.
C.
The pipet is vertical and the pipet tip is against the inner wall of the receiving container. After the solution flows out naturally, stop at least 5s and then move away
D.
The pipet is vertical, the solution flows out naturally and then stops for 15s, then moves away
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【单选题】空压机正常停机步骤正确的顺序是( )。 1停止电动机运转;2人为卸荷;3解除人为卸荷停机后,待气缸温度降至室温后,关闭冷却水;4如周围温度低于0C时,停机应放尽机体内残存冷却水,以防冻裂设备。
A.
②①③④
B.
①②③④
C.
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D.
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【简答题】筛窦的后群开口于（ ）
【单选题】空压机正常停机步骤正确的顺序是()。1停止电动机运转;2人为卸荷:3解除人为卸荷后,待气缸温度降至室温后,关闭冷却水;4如周围温度低于0"C时,停机应放尽机体内残存冷却水,防冻裂设备。
A.
②①③④
B.
①②④③⑥⑤
C.
①③②④
D.
②①④③⑤⑥
【简答题】筛窦的后群开口于（ ）