【简答题】(15分) 已知 G 是合成某高分子化合物的原料,只含 C 、 H 、 O 三种元素, 5 . 9g 物质 G 能与 1mol/LNaOH 的溶液 100mL 恰好完全反应, 0 . 1mol 物质 G 与足量金属钠反应在标准状况下生成 2 . 24L 氢气,分子结构中含有一个甲基, A 的分子式为 C 8 H 13 O 2 Br ,有机物 A 、 B 、 C 、 D 、 E 、 F 、 G 之间...
【简答题】We are now enjoying the cool air in the room. ____, the farmers are harvesting crops in the hot sun. A.Therefore B.Besides C.As a result D.In the meantime
【单选题】A scientist In today's society we are now seeing more children under the age of twelve developing eating disorders. It is estimated that 40% of nine year olds have already dieted and we axe beginning ...
A.
It is important to be thin.
B.
It is fashionable to have diet.
C.
It's a shame that children are being robbed of their childhoods.
D.
It's a shame that children are developing eating disorders.