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【单选题】
下列关于基因工程及其三种工具和四个步骤的叙述，不正确的是( )。A.
基因运载体的种类有、噬菌体和动植物病毒等
B.
EcoR I这种限制酶能够专一识别GAATTC的核苷酸序列
C.
基因工程的第二步骤是目的基因与运载体结合
D.
由于变异是不定向的，所以基因工程也不能定向改造生物的性状
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The INCOTERMS do not deal with _______.
A.
the obligations to clear the goods for export and import.
B.
transfer of ownership and other property rights.
C.
the buyer's obligation to take delivery.
D.
the obligation to provide proof that the respective obligations have been duly fulfilled.
【多选题】What should one do if he or she gets 2019n-Cov ?
A.
Go to the hospital in time .
B.
Hide yourself .
C.
Avoid direct contact of hands with others.
D.
Keep an optimistic attidude and do exercises.
【单选题】工程上，通常脆性材料的延伸率为
A.
<5％< /div>
B.
<10％< /div>
【单选题】Incoterms rules do say about
A.
which costs each party is responsible for.
B.
the price to be paid or the method of its payment.
C.
the transfer of ownership of the goods.
D.
the consequences of a breach of contract.
【多选题】What should one do if he or she gets 2019n-Cov ?
A.
、 Go to the hospital in time .
B.
Hide yourself
C.
Avoid direct contact of hands with others.
D.
Do exercises.
【单选题】The INCOTERMS do not deal with .
A.
the obligations to clear the goods for export and import.
B.
the payment method
C.
the buyer's obligation to take delivery.
D.
the obligation to provide proof that the respective obligations have been duly fulfilled.
相关题目：
【单选题】工程上，通常脆性材料的延伸率为
A.
<5％< /div>
B.
<10％< /div>