单项选择题

粉末镜检可见韧皮薄壁细胞纺锤形，表面有极微细的斜向交错纹理，有时可见菲薄的横隔。此药材是
A、当归
B、防风
C、柴胡
D、白术
E、川芎

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加网技术的发明人是？

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B．塔布特
C．海德堡
D．以上都不对

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Which of the following is NOT the function of tugs?
A、Tugs can be used to move disabled ships.
B、Tugs can be used to move platforms and barges.
C、Tugs can be used to carry large vehicles.
D、Tugs can be used to break ice.