Lucy was born ______ January 30th, 1998, when her sister got married ______ a fashion designer.
A:in; to
B:on; to
C:at; with
D:around; with
“我已经将要毕业了。”犯了用词不当的错误。( )
如图所示,一根均匀的细木棒OC,OA= 14 OC,B为OC的中点,在C点施力将挂在A点的重为180N的物体匀速提升0.2m,木棒的机械效率为90%,这里的木棒是一种简单机械,称为____,提升该物体做的有用功是____J,木棒重为____N(不计摩擦).
经测定某中性溶液中含有Mg2+、Al3+、NO3﹣、SO42﹣四种离子组成,其中Mg2+、Al3+、SO42﹣的个数比不可能为( )