【单选题】带有以下哪种标号的塑料盛水容器,材料稳定性相对较高( )。
【单选题】Every father should realize the important part _______ in his child’s education.
【判断题】不同塑料的相容性与其分子结构有一定关系,分子结构相似者较易相容,分子结构不同时较难相容 。
【单选题】自凝塑料相比于热凝塑料容易变色,其主要原因是
【单选题】If one wants to take part in the sweepstake, which of the statement is true?
A.
He should purchase for entry.
B.
He should be at age of 18.
C.
He doesn't any acceptance at all.
D.
He need to follow the law and rules.
【判断题】在塑料中加入能与树脂相容的高沸点液态或低熔点固态的有机化合物,可以增加塑料的塑性、流动性和柔韧性,并且可改善成型性能,降低脆性。 ( )
【单选题】The second half of his voyage was __________ erous part, during which he sailed round the Cape Horn.
【简答题】The second half of the voyage was by far the ______ part, during which he sailed round the treacherous Cape Horn. (erous)