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【单选题】
在一个具有n个顶点的无，要连通全部顶点至少需要( )条边。A.
n
B.
n+1
C.
n-1
D.
n/2
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【单选题】Vietnam has already signed agreements with nations EXCEPT
A.
China.
B.
Russia.
C.
Pakistan.
D.
India.
【简答题】Once a contract is signed, it has legal effect; no party who has signed a contract has the right to break it.
【单选题】一个做匀加速直线运动的物体 , 初速度 v 0 =2.0 m/s, 在第 2 s 内通过的位移是 5 m, 则它的加速度为 ( )
A.
2.0 m/s 2
B.
0.5 m/s 2
C.
1.0 m/s 2
D.
1.5 m/s 2
【单选题】我校本科生借书册次及期限()
A.
无限制
B.
外借图书10册,外借期限3个月,续借1次,续借期限1个月
C.
图书20册,外借期限4个月,续借1次,续借期限2个月
D.
外借图书10册,外借期限1个月,续借1次,续借期限10天
【简答题】一物体以初速度v 0 =2m/s做匀加速直线运动，第2s末速度为v=4m/s，求： ⑴物体加速度的大小； ⑵笫4s末物体速度的大小： ⑶物体在前4s内位移大小.
【简答题】It was in China＿＿＿the agreement was signed．
【单选题】At present, China has signed many ______ trade agreements with other countries.
A.
comprehensive
B.
reciprocal
C.
favourable
D.
advantageous
【单选题】This company has signed a contract to the natural resources in the west of China. [ ]
A.
express
B.
expect
C.
explode
D.
exploit
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