下列液体中,属于分散系,且不会出现丁达尔现象的是:( )
①烟 ②水 ③雾 ④蔗糖溶液 ⑤Fe(OH)3胶体
A.②④
B.③④
C.①③
D.④
答案:D
细菌的芽孢和外毒素产生在细菌生长的()
A.迟缓期
B.对数生长期早期
C.对数生长期晚期
D.稳定期
E.衰亡期
All of the following works are known as Hardy’s "novels of character and environment" EXCEPT ().
A. The Return of the Native
B. Tess of the D’ Urbervilles
C. Jude the Obscure
D. Far from the Madding Crowd