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【单选题】
下列关于基因技术的叙述中，不正确的是 [ ]A.
基因操作的工具有限制酶、DNA连接酶和运载体
B.
一种限制酶只能识别一种特定的核苷酸序列
C.
基因操作的基本步骤依次为：提取目的基因→目的基因与运载体结合→将目的基本导入受体细胞→目的基因的表达和检测
D.
只要检测出受体细胞中含有目的基因，目的基因就一定能成功表达
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【简答题】The new office opens ________ 30th March.2. All of our shops are open ________ night.3. Can we have a meeting ________ Friday?4. We always have our sales conference ________ July.5. We don't schedule ...
【单选题】There are no bunks for sleeping,just a nice,comfortable cushioned seat.The carriages are clean and roomy.What type of train ticket does this sentence refer to ?
A.
Hard sleeper
B.
soft seat
C.
hard seat
D.
soft sleeper
【单选题】“There are no bunks for sleeping, just a nice, comfortable cushioned seat. The carriages are clean and roomy.” What type of train ticket does this sentence refer to? ( )
A.
hard sleeper
B.
soft sleeper
C.
hard seat
D.
soft seat
【单选题】there are no bunks for sleeping,just a nice,comfortable cushioned seat.The carriages are clean and roomy.what type of train ticket does this sentence refer to ?
A.
Hard sleeper
B.
soft seat
C.
hard seat
D.
soft seat
【简答题】根据所给提示写出单词。 1. Sometimes we _____ food at home. (煮) 2. Mike often _____ (have) a picnic outside on weekends. 3. Do you have a _____ (健康) lifestyle? 4. There _____ (be)some milk in the cup. 5. We often...
【单选题】"There are no bunks for sleeping, just a nice, comfortable cushioned seat. The carriages are clean and roomy." What type of train ticket does this sentence refer to?
A.
Hard sleeper
B.
Soft sleeper
C.
Hard seat
D.
Soft seat
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