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【单选题】
高压系统宜采用 ( )A.
齿轮泵
B.
单作用叶片泵
C.
双作用叶片泵
D.
柱塞泵
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反馈参考答案：
举一反三
【判断题】The year 1997 saw the launch of Project 211, with the aim to establish 211 key institutions of higher education. Project 985, which was launched in 1998 with the aim of building world-class universiti...
A.
正确
B.
错误
【简答题】DTD文件中,表示元素能出现零次或多次的限定符号为____________。
【单选题】---We’ve seen many more days of blue skies recently. ---True. But back in 1998, ________ Beijing started its “Defending the Blue Sky” program, the city only ________ about 100 days a year.
A.
which, sees
B.
that, saw
C.
when, saw
D.
and, seeing
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