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【单选题】
工业发酵中菌种选育最常用的方法是A.
自然选育
B.
诱变育种
C.
分子育种
D.
杂交育种
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反馈参考答案：
举一反三
【简答题】海岛国家,如英国、日本等,也常用 _____ _____ 表示对外贸易。
【简答题】Passage Three According to the dictionary definition of “create”, ordinary people are creative every day. To create means “to bring into being, to cause to exist”—something each of us does daily. We a...
【简答题】海岛国家,如英国、日本等,常用____表示对外贸易。
【单选题】( )可以使设备的母材和焊缝受热和冷却比较均匀,能得到均匀一致的金相组织和强度。
A.
电加热局部热处理
B.
炉内整体热处理
C.
燃气加热局部热处理
D.
内燃式整体热处理
【单选题】– When did you ________ to do the work? - Two months ago, we are through 80% of it at the moment.
A.
set off
B.
set out
C.
set up
D.
set about
【简答题】Correct one verb in each sentence.(请直接把正确形式的动词写出来即可,不需划出错误的动词) We arrived the plane and after 20 minutes it took off. I love walking in the mountains and seeing at beautiful scenery. After the plane l...
【单选题】Only when the CIA Director David was forced to resignthat it‘s hard to keep our e-mail secret.
A.
we realized
B.
realized we
C.
did we realize
D.
we did realize
【简答题】Scientists are working hard to deve10p better aerials for mobile phones , a spokesman for Phikia Phones said today. ‘It really (16) users when they 10se the signal in the middle of a call' so we are d...
【单选题】当核伤面积发展到轨头截面的 ( ) ( 相当于直径 21 ~ 40 mm) 将发生断轨。
A.
、 5-10 ％
B.
、 10-15 ％
C.
、 15-20 ％
D.
、 20 ％～ 30 ％
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