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【单选题】
药材具有“点轮纹”特征的是( )。A.
人参
B.
甘草
C.
大黄
D.
天麻
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举一反三
【单选题】Scientists generally hold that language has been so long in use that the length of time writing is known to cover is ______ in Comparison.
A.
overwhelming
B.
uninspiring
C.
astounding
D.
trilling
【单选题】The major problem with E-mail is that it is(71)easy to use that people can become(72)with messages(73)they can possibly answer in a day. In addition, mail boxes require some management to(74)messages ...
A.
too
B.
so
C.
very
D.
much
【单选题】Scientists generally hold that language has been so long in use that the length of time writing is known to cover is______ in comparison.
A.
overwhelming
B.
uninspiring
C.
astounding
D.
trifling
【简答题】交流异步电动机的调速方式主要有________ 、________和________三种方式。
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