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【单选题】
胃底腺中能分泌盐酸的细胞是( )A.
主细胞
B.
壁细胞
C.
银亲和细胞
D.
颈黏液细胞
E.
内分泌细胞
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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】热继电器主要用来对电气设备进行( )保护; 熔断器是用于供电线路和电气设备的( )保护的电气。
【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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