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【单选题】
电动转辙机表示杆检查柱落入检查块缺口内的两侧间隙为（ ）。A.
1.5mm
B.
1.5mm±0.5mm
C.
2mm
D.
2mm±0.5mm
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【简答题】周皮是次生保护组织,由( )、( )和( )组成。
【简答题】遇到呼吸、心跳骤停的伤病员，应采取哪些措施？
【单选题】Waste gas from cars is one of the major causes of air pollution. Instead of trying to reduce it, can we make good use of it? Now listen to a news report and choose the best answer to each of the quest...
A.
Turning the waste gas from cars into oil.
B.
Turning the waste gas from cars into ink.
C.
Turning the waste gas from cars into fuel.
D.
Turning the waste gas from cars into water.
【单选题】Waste gas from cars is one of the major causes of air pollution. Instead of trying to reduce it, can we make good use of it? Now listen to a news report and choose the best answer to each of the quest...
A.
Turning the waste gas from cars into oil.
B.
Turning the waste gas from cars into ink.
C.
Turning the waste gas from cars into fuel.
D.
Turning the waste gas from cars into water.
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