Pressures on friendship are broad, including ________.
A. demands of work
B. long distance
C. better-paid jobs
D. deadlines
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When is most likely for a person to make true friends?
A. In summer.
B. In childhood
C. In playtime
D. At night
What does “the device” mainly refer to in the last sentence of the passage?
A. Mobile phone.
B. Telephone.
C. MP3 player
D. iPads
下列不是具有挠性构件的输送机械的工作特点的是( )
A. 往复性
B. 循环性
C. 封闭性
D. 旋转性
连续输送机械是以连续的方式沿着一定的线路( )均匀输送散装及成件货物的机械。
A. 从装货点到卸货点
B. 从卸货点到供货点
C. 从供货点到销售点
D. 从需求点到供货点