吸入下列哪种麻醉药可引起痉挛性脑电图改变
A．安氟醚
B．地氟醚
C．异氟醚
D．七氟醚
E．氟烷
参考答案：A
下 * * 种有机物是某些药物中的有效成分。下列说法正确的是
A．三种有机物都能发生水解反应
B．三种有机物苯环上的氢原子若被氯原子取代，其一氯代物都只有2种
C．将等物质的量的三种物质加入氢氧化钠溶液中，对羟基桂皮酸消耗氢氧化钠最多
D．使用FeCl3溶液和稀酸可以鉴别这三种有机物
In a certain flower shop, which stocks four types of flower there are
as many violets as carnation，and
as many tulips as violets．If there are equal numbers of roses and tulips，what percent of the flowers in the shop are carnations
as many violets as carnation，and 
as many tulips as violets．If there are equal numbers of roses and tulips，what percent of the flowers in the shop are carnations