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【单选题】
列车在运行的过程中,需要人工办理闭塞手续,凭出站信号机的显示发车,列车出发后,出站信号机能自动关闭,这种闭塞叫做A.
自动闭塞
B.
半自动闭塞
C.
自动站间闭塞
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
of
B.
for
C.
with
D.
against
【单选题】下列物质中，若将其中能构成人体蛋白质的氨基酸通过脱水缩合形成蛋白质分子，则此蛋白质分子中所含的羧基.氨基和肽键的数目依次是 [ ]
A.
3、3、2
B.
4、3、3
C.
3、2、4
D.
2、2、2
【简答题】Experiments on monkeys were viewed much more negatively than those involving mouse. Indeed, only experiments to develop【M1】______ drugs to treat childhood leukemia were seen as justifying monkeys suff...
【简答题】You should have been more patient ________ that customer I’m sure that selling him the watch was a possibility. A) of B) with C) for D) at
【单选题】I'm surprised that you should have been fooled by such a(an)___trick
A.
ordinary
B.
easy
C.
smart
D.
simple
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