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【单选题】
下列地理分界线为我国人口分界线的是 ( )A.
秦岭 — 淮河一线
B.
南岭一线
C.
黑河 — 腾冲一线
D.
贺兰山 — 横断山一线
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反馈参考答案：
举一反三
【单选题】Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear ____.
A.
must churn the oil in the sump
B.
is connected to the propeller shaft
C.
is driven at the highest RPM
D.
compensates for alignment variations between the engine and pinion gear
【判断题】Although high-speed rail is designed for passenger travel, some high-speed systems also carry some freight service.
A.
正确
B.
错误
【简答题】在单反相机中，控制曝光的机构是快门和（）
【简答题】在单反相机中，控制曝光的机构是（ ）和光圈
【判断题】() 4. Although high-speed rail is designed for passenger travel, some high-speed systems also carry some freight service.
A.
正确
B.
错误
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