【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
【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 ( )
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
【单选题】设m∈R,向量a=(1,m).若|a|=2,则m等于( )
【简答题】根据合同法,以下叙述错误的是【 】 A.定金是合同担保的一种方式 B.定金不得超过主合同标的额的20% C.当事人既约定违约金又有定金的,可以同时适用 D.发生违约时,定金或者加倍返还,或者无权要求返还
【单选题】What bothers David about his neighbor's son?
A.
His neighbor's son plays his piano too loudly.
B.
His neighbor's son's car is too noisy.
C.
His neighbor's son turns on the music till midnight.
【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)=______.
【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.
【单选题】What’s your ________ name ? [ ]