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【判断题】
在图中,控制系统的控制阀从节约水的角度考虑出发应该选用气开阀 。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】设a={2，-3，1}，b={1，-2，3}，c={2，1，2}，向量r满足r⊥a，r⊥b，Prj c r=21，求r
【单选题】---What made him so angry? --- _______.
A.
Because his son escaped from school
B.
His son’s escaping from school
C.
His son escaped from school
D.
What his son escaped from school
【简答题】What worried the mother most was __________ the Internet after class in this school. A．her son’s not forbidding surfing B．her son’s not being forbidden to surf C．her son’s being not forbidden to surf ...
【单选题】How does wheelwright Bian convince the duke that what he is reading is nothing, but rubbish left by a dead man?
A.
He uses dialectical language to debate with the duke
B.
He explains to the duke by asking him to make a wheel himself
C.
He uses a fable story to teach the duke a lesson
D.
He uses his own experience of making wheels to persuade the duke
【单选题】根据我国合同法的规定，以下关于保管合同的叙述错误的是 （ ）
A.
保管合同原则上是实践合同
B.
保管人可以使用保管物，但不得许可他人使用保管物
C.
当事人没有约定或者约定不明确时，保管合同是无偿的
D.
在保管合同为有偿时，寄存人不支付保管费，保管人保管物享有留置权
【简答题】设集合A={1，2，3}，A上的关系R={(1，2)，(1，3)}，则r(R)=______，s(R)=______，t(R)=______．
【简答题】univer____ty (大学)
【单选题】What can we learn from the conversation?
A.
The mother lives with her son.
B.
The mother's son has died.
C.
The mother is always waiting for his son's letters.
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