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【单选题】
关于癌基因的叙述,下列哪项错误的A.
正常细胞中无此基因
B.
基因突变可激活原癌基因表达
C.
正常细胞均可由有癌基因
D.
病毒感染可使该基因活化表达
E.
多种理化因素可活化此基因表达
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【单选题】— What's that terrible noise? — The neighbours for a party. [ ]
A.
have prepared
B.
are preparing
C.
prepare
D.
will prepare
【单选题】The physicist has made a discovery, _____ of great importance to the progress of science and technology. (TE44-1997-45)
A.
I think which is
B.
that I think is
C.
which I think is
D.
which I think it is
【简答题】电气控制线路中,既装设熔断器,又装设热继电器,各起什么作用?能否相互代用?
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