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【判断题】

常用于蔬菜和水果包装的透气好较好的塑料膜是低密度聚乙烯 LDPE、双向拉伸聚苯乙烯 (BOPS)。( )

A.
正确
B.
错误
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】Desperately short of living space and dangerously prone to flooding, the Netherlands plans to start building homes, businesses and even roads on water. With nearly a third of the country already cover...

A.
most parts of the country are covered by water
B.
the country is constantly threatened by floods
C.
it will promote the cultivation of flowers
D.
people think it better to live on water

【单选题】线性低密度聚乙烯是经( )聚合得到的。

A.
配位聚合
B.
自由基聚合
C.
阴离子聚合
D.
阳离子聚合

【单选题】包装在半透性容器中的药物制剂,例如低密度聚乙烯制备的输液袋、塑料安瓿、眼用制剂容器等,加速试验的条件是

A.
温度40℃±2℃、相对湿度75%±5%
B.
温度40℃±2℃、相对湿度25%±2%
C.
温度30℃±2℃、相对湿度65%±5%
D.
温度25℃±2℃、相对湿度40%±5%
E.
温度30℃±2℃、相对湿度50%±5%