管道过热灯亮时(DUCTOVERHEAT),哪个过热电门闭合()。
A、190℉/88℃
B、210℉/99℃
C、250℉/121℃
D、390℉/199℃
参考答案:A
现有下 * * 种有机物:①甲苯、②乙醛、③乙酸乙酯、④苯酚、⑤乙烯.
(1)上述物质中能发生水解反应的是(填序号,下同)______;能发生银镜反应的是______;属于聚合物的单体是______.
(2)上述物质有1种能与浓溴水反应产生白色沉淀,写出反应的化学方程式______.
In relation to employment law, explain the extent to which an employer may make signifi cant changes to the conditions of a labour agreement. (10 marks)