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【单选题】
PPR是丙烯与乙烯的无规共聚物,与均聚聚丙烯(PPH)相比,其性能上的突出优点是( )。A.
拉伸强度高
B.
耐热性好
C.
韧性好
D.
硬度高
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举一反三
【单选题】The author's primary purpose in writing this passage was to ______.
A.
plead for the abolishment of uniforms
B.
show that uniforms are not possible in a democratic society
C.
discuss the pros and cons of wearing uniforms
D.
convince the reader that uniforms have more disadvantages than advantages
【简答题】9 ask sb. for help
【简答题】试述成本与可变现净值孰低法在我国存货计价应用中的相关规定。
【单选题】formally ask (sb.) to do sth.
A.
call on/upon
B.
after all
C.
come to a halt
D.
back and forth
【单选题】This passage mainly discusses______.
A.
changes in the 19th century America
B.
changes in the 20th century America
C.
advantages of modern conveniences
D.
development of railroads in America
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