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【单选题】
引起亚健康的原因是 。A.
以上都是
B.
饮食不合理
C.
睡眠不足
D.
长期不良情绪
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举一反三
【单选题】Penguins are strange and wonderful birds because______.
A.
they only care about their children
B.
the females do not look after their eggs
C.
the males eat nothing while holding their eggs inside their warm fold of skin
D.
all of the above
【单选题】● 假设需要把25盒磁带数据（每盒磁带数据量40GB）从甲地转送到乙地，甲、乙相距1km，可以采用的方法有汽车运输和TCP/IP网络传输，网络传输介质可选用双绞线、单模光纤、多模光纤等。通常情况下，采用（13）介质，所用时间最短。 （13）
A.
汽车
B.
双绞线
C.
多模光纤
D.
单模光纤
【简答题】完形填空。 Wishing to encourage her young son's progress on the piano, a mother took her boy to a Paderewski concert. After they were seated, the mother 1 a friend and walked down the aisle to greet her. S...
【简答题】When his young son was ill, Mr. Wei took him to a clinic( 诊所 ). They were the first of the day and did not have to wait long. The nurse took the boy into the doctor’s room while Mr Wei waited outside....
【单选题】假设需要把25盒磁带数据(每盒磁带数据量40GB)从甲地转送到乙地，甲、乙相距1km，可以采用的方法有汽车运输和TCP/IP网络传输，网络传输介质可选用双绞线、单模光纤、多模光纤等。通常情况下，采用(13)介质，所用时间最短。
A.
汽车
B.
双绞线
C.
多模光纤
D.
单模光纤
【判断题】子午线轮胎帘布层帘线排列方向与轮胎的子午断面一致,使其强度得到充分利用,所以帘布层数可比普通斜交轮胎减少约40%一50% 力小,滚动阻力小,降低油耗。
A.
正确
B.
错误
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