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【单选题】
亚硝酸钠滴定法测定盐酸普鲁卡因含量时用的酸为A.
盐酸
B.
硫酸
C.
氢溴酸
D.
硝酸
E.
磷酸
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皮皮学刷刷变学霸
举一反三
【单选题】In para. 4 the author uses an example to show______.
A.
what a low concentration of oxygen-carrying red cells will do
B.
the serious consequence of imbalance of the blood
C.
how a low concentration of white cells reduce the body's ability to fight infection
D.
how the red cells to carry oxygen to every part of body
【单选题】______ the cold, thin air and low oxygen levels also can cause mountain sickness.
A.
On behalf of
B.
Apart from
C.
In terms of
D.
Except for
【简答题】A．Lack of oxygen. B．Overgrowth of water plants. C．Low water level. D．Serious pollution upstream.
【单选题】Which of the following means low oxygen?
A.
anoxia
B.
aphasia
C.
hypoxia
D.
hydrocele
【单选题】What did the seven Russian submariners suffer from?
A.
A lack' of oxygen and low temperature.
B.
Heavy fever.
C.
Faint and headache.
D.
Hunger and cold.
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