氯贝丁酯为()
A.白色粉末,微有引湿性
B.油状液体有轻微特臭,有引湿性
C.具旋光性白色结晶性粉末
D.油状液体有特异臭
E.加稀盐酸溶解后,滴加氯水显缨红色
参考答案:B
—It's a long story, but there are not any new words in it.
—Good! _______ it will be hard for children. [ ]
A. So
B. Or
C. But
D. And
降尘和飘尘的特点是什么?