皮皮学，免费搜题
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【多选题】
推土机传动系统由下列组成A.
机械式传动系统
B.
液力机械式传动系统
C.
静液压式传动系统
D.
电传动系统
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皮皮学刷刷变学霸
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【简答题】（p1wu?北京）在△ABC中，a=u，b=p 6 ，∠B=p∠A． （Ⅰ）求cosA的值； （Ⅱ）求c的值．
【简答题】岩石和矿物在有很多应用,请你写出应用的例子。
【简答题】半自动售票机日常维护方法。
【单选题】P rofessor Wu told us that by the end of the year he _______ here for 3 years.
A.
will have worked
B.
will have been working
C.
has been working
D.
would have been working
【单选题】Mrs. Wu told me that her sister___________.
A.
left about two hours before
B.
would leave about two hours before
C.
has left about two hours ago
D.
had left about two hours before
【单选题】Professor Wu told us that by the end of the year he______here for three years.
A.
will have worded
B.
will have been working
C.
would have been working
D.
has been working
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