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【单选题】
工作期间，工作票应始终保留在()手中。A.
工作票签发人
B.
工作负责人
C.
工作许可人
D.
专责监护人
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反馈参考答案：
举一反三
【多选题】表面更新理论的基本要点为 __________ 。
A.
液体在下流过程中不断有液体从主体转为界面而暴露于气相中，从而大大强化了传质过程
B.
随时的表面更新使得深处的液体有机会直接与气体接触以接受溶质
C.
传质系数与扩散系数的 0.5 次方成正比
D.
液体在下降的过程中每隔一定的时间 发生一次完全的混合，并使液体的浓度均匀化
【单选题】—Hi, Tom. Is your brother as active as you? —No, he's a quiet boy. He is _________. [ ]
A.
less outgoing than me
B.
not so calm as I
C.
more active than I
D.
as outgoing as I
【单选题】The _______ work continued for more than a week but there was still no sign of the missing boy.
A.
research
B.
rescue
C.
vessel
D.
vast
【单选题】— Hi, what did our monitor say just now? — Every boy and every girl as well as teachers who are to visit Water Cube ______ asked to be at school gate before 6∶30 tomorrow morning.
A.
is
B.
were
C.
are
D.
was
【单选题】The little boy put the bird in a cage to ______ it from flying away.
A.
avoid
B.
prevent
C.
hinder
D.
resist
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