2.What do the prisoners use ramen (日式拉面) to do?
A. Smuggle cigarettes in the black market.
B. Hire services from other prisoners.
C. Exchange it for money.
D. Bribe(行贿) the cook.
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3. Why is ramen replacing traditional cigarettes as money in American prisons?
A. It is cheap and easier to get.
B. It is valuable and difficult to get.
C. It is healthier than cigarettes.
D. It is more delicious than other food.
篮球质量0.6Kg,从最高处下落,到达地面速率6米/秒,原速率反弹,动量的增量的大小为()
A. 7.2
B. 3.6
C. 0.6
D. 1.2
篮球质量0.6Kg,从最高处下落,到达地面速率6米/秒,原速率反弹,若与地面作用时间为0.01秒,则与地面相互作用力大小为 ( )(SI)
A. 120
B. 360
C. 720
D. 800
用于疲劳驾驶的视觉传感器安装在( )位置。
A. 车辆前部
B. 车辆侧面
C. 车辆内部
D. 车辆后部