一种起机械支持作用的器官是()
请根据以下内容回答 60~64 题
A.An organ of higher plants, usually subterranean and having several functions,including the absorption and conduction of water and dissolved minerals, food storage,and anchorage of the plant in the soil. It is distinguished from the stem by its structure,by the manner in which it is formed, and by the lack of such appendages as buds and leaves.
B.It grow horizontally, as a food-storing organ, beneath the surface of the ground, and enables a plant to reproduce itself.It has nodes, buds,and tiny leaves and does not die when cut; replanted, it yields new plant.
C.both A and B
D.neither A nor B
第 60 题 一种起运输作用的器官是()
A.服务器
B.终端
C.交换机
D.中间件
下列对N一亚硝基化合物致癌作用特点描述正确的是
A.只能诱发少数实验动物的肿瘤
B.只有通过消化道摄入才可诱发肿瘤
C.一次大量给药不具有致癌作用
D.不能通过胎盘对子代产生致癌作用
E.可诱发动物几乎所有组织和器官的肿瘤
为了保护您的账号安全,请在“简答题”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!