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【单选题】
下列有关操纵子的论述哪个是错误的?A.
操纵子是由启动子、操纵基因与其所控制的一组功能上相关的结构基因组成的基因表达调控单位
B.
操纵子不包括调节基因
C.
代谢底物往往是该途径的可诱导酶的诱导物，代谢终产物是可阻遏酶的辅阻遏物
D.
真核细胞的酶合成也存在诱导和阻遏现象，因此也是由操纵子进行调控的
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举一反三
【单选题】—Why does she always ask you for help? —There is no one else , is there ?
A.
who to turn to
B.
for whom to turn
C.
she can turn to
D.
for her to turn
【单选题】—Why does she always ask you for help? —There's no one else she can _____, is there? [ ]
A.
refer to
B.
make use of
C.
care about
D.
turn to
【单选题】— Why does she always ask you for help? — There is no one else____,is there? [ ]
A.
who to turn to
B.
she can turn to
C.
for whom to turn
D.
for her to turn
【单选题】-Why does she always ask you for help? -There is no one else _______,is there? [ ]
A.
who to turn to
B.
she can turn to
C.
for whom to tum
D.
for her to tum
【单选题】患者女性，70岁，被人用轮椅推入医院，接诊护士看见其而色发绀，呼吸困难，询问病史得知其有慢性阻塞性肺疾病史，给予吸氧流量应是
A.
1~2L／min
B.
2～4L／min
C.
4～6L／min
D.
6～8L／min
E.
8～10L／min
【单选题】— Why does she always ask you for help? — There is no one else _______, is there? [ ]
A.
who to turn
B.
she can turn to
C.
for whom to turn
D.
for her to turn
【单选题】下列各组物质可能共存的是 ( ) (A) (B) (C) (D)
A.
Cu 2+ ,Fe 2+ ,Sn 4+ ,Ag
B.
Cu 2+ ,Ag + ,Fe 2+ ,Fe
C.
F e 3+ , Fe, Cu 2+ , Ag
D.
Fe 3+ , I - , Sn 4+ ,Fe 2+
【单选题】— Why does she always ask you for help? — There is no one else _______, is there?
A.
who to turn to
B.
for her to turn
C.
for whom to turn
D.
she can turn to
【简答题】Why does she always ask you for help?There is no one else_______,is there? A .who to turn to B. she can turn to
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