烟草产生单倍体植株的途径有哪些？
参考答案：
孤雌生殖、远缘杂交、未受精的子房、胚珠培养、花药培养等，目前应用较多的方法是花药培养
Originally introduced by Netscape Communications,（1）are a general mechanism which HTTP Server side applications, such as CGI (2) , can use to both store and retrieve information on the HTTP （3） side of the connection. Basically, Cookies can be used to compensate for the （4） nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based （5）.
5.见题干（）
A. programs
B. applications
C. frameworks
D. constrains
与黄曲霉毒素有关的肿瘤是
A．肝癌B．食管癌C．结肠癌D．子宫颈癌D．鼻咽癌
