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【简答题】
糖类物质的主要生物学作用为 、 、 和 。
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举一反三
【单选题】The Solo Trek is able to lift off the ground by using ______ .
A.
a solar powered engine
B.
engine-powered twin fans
C.
large flapping wings
D.
rotating blades
【简答题】下列明显违反了“勤勉尽职”的要求的是（ ）
【单选题】Why does Culhane say the solar- powered waters heaters demonstrate that "renewable energy is not some exotic technology"?
A.
The solar-powered heaters are expensive and difficult to make.
B.
The solar-powered heaters can decrease potential energy costs.
C.
The solar-powered heaters can be built simply with found materials.
【简答题】阅读理解。 A Solar-powered Plane-Lowcarbon Earlier this month, a solar-powered (太阳能动力的) plane called Lowcarbon took off to the sky for the first time. It has passed an important test on the way to travel a...
【单选题】A solar car is an electric car powered by ______ electricity.
A.
sun
B.
hydrogen
C.
pure
D.
solar
【简答题】以下哪一项明显违反了“勤勉尽职”的要求?（ ）
【多选题】以下列出了术语与其英文缩写的对应关系,正确的是
A.
广域网的英文缩写为WSN
B.
城域网的英文缩写为MAN
C.
个人区域网的英文缩写为PON
D.
无线网状网的英文缩写为WMN
E.
无线局域网的英文缩写为WLAN
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