皮皮学，免费搜题
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搜题
【单选题】
在半自动闭塞区段,当接车进路信号机不能使用时,列车凭( )越过A.
B.
半自动闭塞发车进路通知书
C.
引导信号
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文： London in the 17th century was very attractive, like many European cities of the time. There was a beautiful cathedral, St. Paul's, and a magnificent Town Hall, the Guildhall. Also, there were m...
A.
Near Town Hall.
B.
In a narrow, dirty street.
C.
Behind many attractive churches.
D.
On the south side of the River Thames.
【单选题】下列描述最能确切表达质粒DNA作为克隆载体特性的是:
A.
小型环状双链DNA分子
B.
携带有某些抗性基因
C.
在细胞分裂时恒定地传给子代细胞
D.
具有自我复制功能
【单选题】In our class, when the bell rang and the teacher closed his book, it was a ________ for everyone to stand up. [ ]
A.
signal
B.
chance
C.
mark
D.
measure
【单选题】下列描述最能确切表达质粒DNA作为克隆载体特性的是
A.
小型环状双链DNA
B.
携带有某些抗生素抗性基因
C.
在细胞分裂时恒定地传给DNA
D.
具有自我复制功能,
E.
获得目的基因
【简答题】In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up. A．signal B．chance C．mark D．measure
【单选题】All the following are closed class words EXCEPT______.
A.
conjunctions
B.
prepositions
C.
adjectives
D.
pronouns
相关题目：
【单选题】下列描述最能确切表达质粒DNA作为克隆载体特性的是
A.
小型环状双链DNA
B.
携带有某些抗生素抗性基因
C.
在细胞分裂时恒定地传给DNA
D.
具有自我复制功能,
E.
获得目的基因