题目内容

He always ____ an air of indifference. However, he is very concerned about it.

A. supposes
B. assures
C. ensures
D. assumes

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I know life in Hollywood is fast-paced, but could you guys ____ a little?

A. keep up with
B. turn down
C. pull up
D. slow down

分析诱导期时，先用胶质溶剂洗涤样品瓶中的，再用自来水充分洗涤

诱导期测定的是在加速条件下的氧化安定性。

分析诱导期时，用镊子把玻璃样品瓶放入氧弹内，并加入ml试样，盖上样品瓶，关紧氧弹。