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【单选题】
单气路气相色谱仪的工作流程为:由高压气瓶供给的载气依次经()A.
减压阀，稳压阀，转子流量计，色谱柱，检测气后放空
B.
稳压阀，减压阀，转子流量计，色谱柱，检测器后放空
C.
减压阀，稳压阀，色谱柱，转子流量计，检测器后放空
D.
稳压阀，减压阀，色谱柱，转子流量计，检测器后放空
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皮皮学刷刷变学霸
举一反三
【单选题】_________ first time I met him in his office, he shook me by _________ hand warmly and then introduce himself to me.
A.
The; 不填
B.
The; the
C.
The; a
D.
A; 不填
【单选题】I have no experience related to _______, since it's the first time for me to handle such a problem. [ ]
A.
call upon
B.
live on
C.
take on
D.
draw upon
【单选题】One of them told me, “This is the first time I ________ to the capital to attend the flag-raising ceremony.”
A.
came
B.
come
C.
have come
D.
had come
【单选题】Please show me ______ to send an e-mail, John. It's the first time for me to do it. [ ]
A.
how
B.
what
C.
when
D.
where
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