各种单体抗体分子都有的特性是( )
A．分子量在10万以下
B．具有两个完全相同的抗原结合部位
C．H链与L链借非共价键相联
D．能结合补体
E．能促进吞噬
要到微信小程序或APP查看答案哦。
实在点不开答案，可以分享到微信，
在微信里面查看答案。
APP具体操作流程为：
一裹圆
上颌骨骨折后复位固定的时间最迟不应超过（）
A.1周
B.2周
C.3周
D.4周
E.没有限制
患者，女，38岁，已婚。近几年形体渐胖，胸闷呕恶，倦怠乏力，月经停闭半年，平时带下量多色白，舌淡胖苔白腻，脉沉滑。尿妊娠试验阴性。治疗应首选（）
A.血府逐瘀汤
B.苍附导痰丸
C.参苓白术散
D.开郁二陈汤
E.香砂六君子汤
工业给水系统可分为（）
A.直流给水系统
B.循环给水系统
C.循环给水管网
D.混合给水系统
Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.
Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment.\
17（）
A.essential
B.important
C.possible
D.inevitable