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【单选题】
变压器油是流动的液体，可充满油箱内各部件之间的气隙，排除空气，从而防止各部件受潮而引起绝缘强度的（）。A.
升高
B.
降低
C.
时低
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举一反三
【单选题】The young man promised to his parents, 'I would never ______ again.'
A.
let you down
B.
let you out
C.
let you in
D.
let you by
【单选题】Use of electronic mail (e-mail) has been wide-spread for more than a decade. E-mail simplifies the flow of ideas, connects people from distant offices, eliminates the need for meetings, and often boos...
A.
is not always the easiest way to connect people from distant offices.
B.
has changed considerably since it first began a decade ago.
C.
causes people to be unproductive when it is used incorrectly.
D.
is effective for certain kinds of messages but only if managed wisely.
【单选题】组成脱氧核糖核酸(DNA)的核苷酸不包括( )。
A.
腺嘌呤核苷酸(A)
B.
鸟嘌呤核苷酸(G)
C.
胞嘧啶核苷酸(C)
D.
尿嘧啶核苷酸(U)
E.
胸腺嘧啶核苷酸(T)
【单选题】组成核糖核酸(RNA)的核苷酸不包括( )。
A.
腺嘌呤核苷酸(A)
B.
鸟嘌呤核苷酸(G)
C.
胞嘧啶核苷酸(C)
D.
胸腺嘧啶核苷酸(T)
E.
尿嘧啶核苷酸(U)
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