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【单选题】
“”乳酸亚铁口服液可以有效地治疗人类缺铁性贫血症，这是因为其中的Fe 2+ 进入人体后能 [ ]A.
调节血液的酸碱平衡
B.
构成红细胞中的血红蛋白
C.
调节血液渗透压
D.
作为能源物质为红细胞提供能量
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A.
card
B.
form
C.
note
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【单选题】He has _______the cup ______water.
A.
fills ; with
B.
filled; of
C.
filled; with
D.
fill; of
【单选题】His eyes ______ tears when he listened to the sad story.
A.
are filled with
B.
are filled of
C.
were filled with
D.
were filled of
【简答题】在同一种媒体中传输信号时,如果信道长度固定,为了增加传输容量,不可能通过减少 ___________来解决,而只能通过增加_____ 来实现。
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