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【多选题】
Why does each cell membrane contain a characteristic set of different transporters?A.
Transporters are responsible for the movement of most small, watersoluble, organic molecules and a handful of inorganic ions across cell membranes. Each transporter is highly selective, often transferring just one type of solute.
B.
To guide and propel the complex traffic of substances into and out of the cell, and between the cytosol and the different membrane-enclosed organelles, each cell membrane contains a characteristic set of different transporters appropriate to that particular membrane.
C.
For example, the plasma membrane contains transporters that import nutrients such as sugars, amino acids, and nucleotides; the lysosome membrane contains an H + transporter that imports H + to acidify the lysosome interior and other transporters that move digestion products out of the lysosome into the cytosol.
D.
T he inner membrane of mitochondria contains transporters for importing the pyruvate that mitochondria use as fuel for generating ATP, as well as transporters for exporting ATP once it is synthesized.
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【单选题】In the third paragraph, 'three weeks of round-the-clock effort' means ______.
A.
for three weeks the hospital was taking in SARS patients without stopping
B.
Dr. Urbani worked day and night for three weeks, trying to get SARS under control
C.
for three weeks Dr. Urbani did not have any time to sleep, trying hard to fight the new disease
D.
After three weeks' hard work to control SARS, the hospital superior thought it was time to stop the clock
【简答题】On an island there are exactly seven towns: T, U, V, W, X, Y and Z. All existing and planned roads on the island are two-way and run perfectly straight between one town and the next. All distances(距离；...
【单选题】An un-loader is installed on an air compressor to _____.
A.
bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service
B.
prevent excessive inter-stage pressure buildup
C.
control compressor discharge pressure
D.
remove all but the frictional load during starting
【单选题】—How often do you surf the Internet? —_____. [ ]
A.
Three times a week
B.
A week three times
C.
Three weeks a time
【单选题】听力原文：M: I was away for three weeks, but it seems like three days. W: So you must have had a very good time in Guilin. What do we know about the man?
A.
He enjoyed himself in Guilin.
B.
He didn't like traveling in Guilin.
C.
He spent three days in Guilin.
【多选题】关于循环左移指令和循环右移指令,说法正确的是:( )。
A.
循环左移指令ROL使目标操作数中各位数据向左循环移n位，最后将从最高位移出的数据存于进位标志M8022中
B.
循环右移指令ROR使目标操作数中各位数据向右循环移n位，最后将从最低位移出的数据存于进位标志M8022中。
C.
执行这两条指令时，如果目标操作数为位组合元件，则只有K4或K8才有效
D.
移位指令只能使用脉冲执行形式或者边沿执行条件
【多选题】NK细胞表面表达十分复杂的受体谱,以此识别正常和异常的细胞,并调控其活化、增殖及其他功能,这些受体包括
A.
抑制性受体
B.
活化性受体
C.
黏附分子受体
D.
细胞因子受体
E.
趋化因子受体
【单选题】The ____ stage air compressors are widely used on board the ship.
A.
single
B.
II
C.
III
D.
multiple
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