用化学用语填空：
①2个汞原子 ②3个三氧化硫分子
④氢氧化钙中钙元素的化合价 ⑤铵根离子
①2Hg ②3SO3 ③ ④NH4+
对于财产保险保险利益的时效规定是（）。
A.始终具有保险利益
B.索赔时具有保险利益
C.投保时具有保险利益，而索赔时追究有无保险利益
D.以上都不正确
Lack of teamwork can result in _____by rivals when we have a basketball game. [ ]
A. defeated
B. being defeated
C. defeating
D. to be defeated
④NH4+ 
④NH4+