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【单选题】
A2 题型 女31岁,孕70天,自然流产,基因缺陷主要为A.
染色体断裂
B.
染色体易位
C.
染色体数目异常
D.
染色体倒置
E.
染色体缺如
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【单选题】某双链 DNA 分子中腺嘌呤的含量是 15% ,则胞嘧啶的含量应为( )。 [ 浙江工业大学 2018 研 ]
A.
15%
B.
30%
C.
35%
D.
42.5%
【单选题】Which is the only letter that can be pronounced as /æ/ in English words?
A.
u
B.
e
C.
o
D.
a
【简答题】It was announced that only when the terrible disease was under control _______ to return to their homes. A. the residents would decide B. would the residents decide C. would the residen...
【单选题】How did the residents in the Vrain School District respond to the budget shortage?
A.
They felt somewhat helpless about it
B.
They accused those responsible for it
C.
They pooled their efforts to help solve it
D.
They demanded a through investigation
【单选题】An emergency bilge pumping system is provided and should be _____ of the main bilge pumping system, according to the SOLAS 74 Convention.
A.
dependent
B.
independent
C.
in series
D.
in parallel
【单选题】Accidental flooding of the engine room bilges by the bilge main is prevented by( ).
A.
stop-check valves installed in the bilge suction manifolds
B.
using a positive displacement reciprocating bilge pump
C.
installing educators in all bilge rose boxes
D.
installing a swing check before each bilge valve
【简答题】茎和根在外部形态上最主要的区别是:茎具有 ____和____,茎上长有____、____。
【简答题】茎和根在外部形态上最主要的区别茎具有: ___________________ 、 __________________ 、 ___________________ 、 ______________________ 。
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