题目内容

下面属于聚酯类可降解材料的是

A. 聚3-羟基烷酸酯
B. 聚ε-己内酯
C. 聚磷酸酯
D. 聚乙交酯

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更多问题

聚磷腈主链结构是由磷和氧原子交替组成的高分子聚合物

A. 对
B. 错

Manual workers often receive much higher ______ than people who work in offices

A. gains
B. fees
C. payments
D. wages

His ______ kept his secret.

A. brothers
B. workmates
C. companions
D. comrades

His rise in status more than ______ the loss of money.

A. pays back
B. rewards
C. compensates for
D. values

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