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【多选题】
基因工程的操作包含以下步骤:A.
A获得目的基因；
B.
B构造重组 DNA 分子；
C.
C转化或转染；
D.
D蛋白质的表达和产物的分离纯化。
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【简答题】简单叙述Y —Δ降压启动的优缺点。
【单选题】“Read books, go to movies, take on new hobbies or activities that force one to think in novel ways.” he says. In other words, keep your brain busy and working. And also get physically active, because ...
A.
actually
B.
naturally
C.
in relation to your body
D.
in relation to your mind
【多选题】Major contents of forest engineering
A.
forest ecology
B.
forestry machinery and equipments
C.
forest roads & bridges & culverts
D.
forest econmics
E.
intellectual forestry
F.
forest operations science and technology
【简答题】Major forest types in China
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