题目内容
（请给出正确答案）
A.Implants and supporting materials
B.Medical devices
C.Smart hand ring
D.Drug delivery systems
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更多“Biomaterials have been develop…”相关的问题
A、Implants and supporting materials
B、Medical devices
C、Smart hand ring
D、Drug delivery systems
How has the use of helicopters developed？
A．They are taking the place of high-flying jets.
B．They are used for rescue work only.
C．They have been widely used for various purposes.
D．They are now used for commercial purposes.
Various means of transportations (have) ______ been established.
The book seems to have been ________ from various books and articles.
A．pieced together
B．taken off
C．broken away
D．pulled out
A．developed
B．have developed
C．are being develope
D．will have been developed
(All of) the plants now (raised) on farms (have been) developed from plants (once grew) wild.
A．All of
B．raised
C．have been
D．once grew
Since 1978, many new()have been developed in our university to meet the increasing demands of the students.
A、disciplines
B、entrances
C、checks
D、flames
A、The minority concentrated regions have witnessed continued economic and social development.
B、The economy and society of the ethic minority areas have been developed continuously.
C、The economic and social ethic minority areas have been developed continuously.
D、Continued economic and social development has been achieved in the minority concentrated regions.
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