试求由球面
与平面z=1所围成的密度为1的均匀体Ω对原点处单位质点的引力.
参考答案:
,
, 由对称性知:
,其中G为引力常数,
故所求引力为
.
— I never thought she would ______ my invitation to the concert.
— She would feel sorry for missing the concert someday. [ ]
A.refuse
B.suppose
C.return
D.remind
领导干部任期经济责任审计过程一般分为()。
A.申请
B.准备
C.实施
D.复议