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【简答题】
将a→e与A→E进行匹配。 a. 限制性内切酶 b. 反转录酶 c. 核酸外切酶 d. Taq DNA聚合酶 e. DNA连接酶 A.重组DNA技术中实现目的基因与载体DNA拼接的酶 B.催化聚合酶链式反应的酶 C.用于DNA修复的酶 D.cDNA第一链合成时需要用到的酶 E.在重组DNA技术中,能特异性酶切DNA的酶
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皮皮学刷刷变学霸
举一反三
【单选题】“杂费”栏应填( )。
A.
502/一200/3
B.
502/20/2
C.
502/5 486.42/3
D.
502/一5 486.42/3
【单选题】She was absent for class today? Do you know the reason ____she was absent?
A.
what
B.
why
C.
how
D.
when
【简答题】估算. 485×5≈ 502×6≈ 396×7≈ 290×8≈ 492×7≈ 104×8≈
【单选题】She was absent __the meeting yesterday because she was ill.
A.
on
B.
in
C.
for
D.
from
【单选题】现金流量图中无法直观反映的有( )
A.
现金流的大小
B.
现金流的方向
C.
现金流的风险
D.
现金流发生的时点
【单选题】The girl _____ a colorful pencil. [     ]
A.
there is
B.
there are
C.
have
D.
has
【单选题】How many rubbers _______ in your pencil box? [     ]
A.
there is
B.
there are
C.
is there
D.
are there
【判断题】三相不对称负载Y形连接时,为了使各相电压保持对称,必须采用三相四线制供电。( )
A.
正确
B.
错误
【单选题】She was absent through sickness .
A.
disease
B.
illness
C.
recovery
D.
infection
【单选题】“杂费”栏应填( )。
A.
502/-200/3
B.
502/20/2
C.
502/5 486.42/3
D.
502/-5 486.42/3