【单选题】【消耗次数：1】
在气相色谱中，直接表征组分在固定相中停留时间长短的保留参数是
①
保留时间
②
调整保留时间
③
死时间
④
相对保留值
参考答案：
复制
纠错
➡️如需代学继续教育，联系微信：yizhituziang
相关题目
【单选题】
在反相键合相色谱法中，若以甲醇-水为流动相，增加甲醇的比例时，组分的容量因子k与保留时间tR将有何变化
①
k与tR增大
②
k与tR减小
③
k减小，tR
④
k增大，tR减小
【单选题】
反相键合相色谱分离一化合物，若以乙腈-0.4%乙酸为流动相，减小乙腈的比例，则该化合物的容量因子K值和保留时间tR
①
K增加，tR减小
②
K减小，tR减小
③
K增加，tR增加
④
K减小，tR增加
随机题目
【单选题】
Encouraging the elderly people to participate games is very important.
①
at
②
in
③
with
④
for
【单选题】
Tom won the first prize of oral English contest, which is beyond his ______.
①
reputation
②
contribution
③
expectation
【单选题】
It is said that ______ 2000 factories closed down during the economic crisis.
①
properly
②
approximately
③
. considerably
【单选题】
—How do you feel about your family life? — .
①
Good. It’s a good choice to work there.
②
Not bad. I think it is a good choice to be a full-time mother.
③
Not bad. I have visited their family a lot of times.
【单选题】
—Linda, what’s wrong with your grandmother?— .
①
She is not retired
②
She hurt her leg.
③
She got a new house.
④
she is tired.
【单选题】
Due to the increasing aging population in China, demand the caregivers will continue to rise.
①
with
②
of
③
for
④
and
【单选题】
Young people ______ 62% of University teaching staff.
①
comprise
②
compose
③
contain
【单选题】
—Our son has picked up some bad habits recently, and I am really worried about it.— .
①
Yes, they have some bad habits.
②
Cheer up. I believe he will overcome it.
③
Well, he like drawing.