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双组分聚氨酯漆必须按规定的比例调配，调和后，要在6h内用完，应现用现配，不宜多配，以免多余的漆隔夜胶结变质。( )

A. 对
B. 错

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Questions 17—20 are based on the following conversation. Who would be most interested in the advances mentioned in the talk

A. Inventors.
B. Science fiction writers.
C. Photographers.
D. Health-care workers.

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对溶剂敏感的塑料制品，采用低级醇或挥发速度快的芳香族溶剂揩拭。( )

A. 对
B. 错

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静电喷涂室内的通风装置，应在操作前5min打开，在操作完毕立刻关闭。( )

A. 对
B. 错

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Questions 14—16 are based on the following conversation. Which of the following statements is true according to the speaker

A. Most people have dictionaries but don’t use them frequently.
B. Most people don’t have dictionaries but need them very often.
C. Most people have dictionaries and use them very often.
D. Most people don’t have dictionaries and seldom need them.

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双组分聚氨酯漆必须按规定的比例调配，调和后，要在6h内用完，应现用现配，不宜多配，以免多余的漆隔夜胶结变质。( )

A. 对 B. 错

Questions 17—20 are based on the following conversation. Who would be most interested in the advances mentioned in the talk

对溶剂敏感的塑料制品，采用低级醇或挥发速度快的芳香族溶剂揩拭。( )

静电喷涂室内的通风装置，应在操作前5min打开，在操作完毕立刻关闭。( )

Questions 14—16 are based on the following conversation. Which of the following statements is true according to the speaker

A. 对
B. 错