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【单选题】
在气相色谱法中,当( )进入检测器时,记录笔所划出的线称为基线。A.
无载气
B.
纯载气
C.
纯试剂
D.
空气
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反馈参考答案：
举一反三
【单选题】He is a resolute man. Once he makes up his mind to do something, he won't give it up halfway.
A.
strange
B.
firm
C.
kind
D.
clever
【单选题】Once again he failed to hand in his homework he had been given enough time to do it.
A.
in order that
B.
as though
C.
even though
D.
so that
【单选题】Byrd at once ordered them to do this, he ordered them to do this____.
A.
once
B.
soon
C.
immediately
D.
quickly
【单选题】Once he has made up his mind to do something, it is impossible to stop him ______ it.
A.
to do
B.
do
C.
from doing
【单选题】Once he makes up his mind to do something, he will devote himself _________to it.
A.
strongly
B.
extremely
C.
entirely
D.
freely
【单选题】He is a resolute man. Once he made up his mind to do something, he won’t give it up halfway.
A.
weak
B.
firm
C.
kind
D.
clever
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