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【单选题】
大多塑料对酸碱盐溶液都具有良好的抵抗能力,对水、蒸汽、有机溶剂也具有不同程度的稳定性,超过许多金属及合金材料。其中,()被称为塑料,就连煮沸的水都无法被腐蚀。A.
聚四氟乙烯
B.
聚四氟丙烯
C.
聚四氟丁烯
D.
有机玻璃
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【简答题】阅读理解。 Years ago, if a person has some problems in his life, he might go home and write in his diary. Now he might go onto the Internet and write about them in a blog(博客). Differences between a blog an...
【简答题】隐式转换可以通过直接变量_________赋值的方法实现,即直接把给变量重新赋值,从而改变其类型。
【单选题】According to Paragraph 6, what error had Ames made at first?
A.
He thought only man-made chemicals dangerous.
B.
He suspected his experiments and tests.
C.
He is sometimes naive and ignorant.
D.
He considered most natural substances negativ
【单选题】在计算砌筑墙体工程量时 ( )
A.
不扣除门洞口所占的体积
B.
不扣除窗洞口所占的体积
C.
不扣除嵌入墙身的钢筋混凝土柱梁所占的体积
D.
不扣除墙内的加固钢筋所占体积
【单选题】He got up late and hurried to his office, ____the breakfast che untou d.
A.
left
B.
to leave
C.
leaving
D.
having left
【简答题】推销人员在推销过程中，首先推销的是______，其次是推销______，最后才是推销______ 。
【简答题】完形填空。 Tony loved basketball. One afternoon on his way to a basketball , he was walking and dreaming about playing college 1 the next year. Suddenly a car hit him and he was thrown three 2 into the...
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