确定社区健康问题重点是根据()。
A.社区的需要
B.社区的能力
C.社区的资源
D.社区的环境条件
E.社区的社会条件
参考答案:A
A recent survey shows that the number of children who from the countryside with their parents ________nearly 320,000 in Beijing.
A.comes; are
B.come; is
C.come; are
D.comes; is
物体质量为m=5Kg放在粗糙的水平面上,在力F的作用下做a=2m/s2的匀加速直线运动,方向向右,已知物体与地面之间的动摩擦因数为0.3,则外力F为( )
B.15N
C.25N
D.10N