蝇与传病无关的形态结构及生活习性是()
A.全身被有细毛
B.爪垫分泌粘液
C.有复眼1对
D.食性杂,取食频繁
E.边吃边吐边排
参考答案:C
--- The free gift doesn’t look good.
--- _____, madam, but if you want good quality, you have to pay for it.
A.No doubt
B.No offence
C.No problem
D.No way
下列关于常见有机物的说法不正确的是 ( )
A.苯和乙烯都能与H2发生加成反应
B.乙酸和油脂都能与氢氧化钠溶液反应
C.除去乙醇中少量的乙酸:加足量生石灰,蒸馏
D.等物质的量的乙醇和乙酸完全燃烧时所需氧气的质量相等