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【判断题】
DNA的基本单位之间连接方式是肽键。A.
正确
B.
错误
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【单选题】The graphite shape in ( ) is lamellar.
A.
gray iron
B.
Malleable iron
C.
Nodular iron
D.
Vermicular iron
【单选题】“人生得意须尽欢,莫使金樽空对月。天生我材必有用,千金散尽还复来。” 出自诗人李白下列哪首诗( )
A.
《蜀道难》
B.
《将进酒》
C.
《望庐山瀑布》
D.
《梦游天姥吟留别》
【简答题】二十三《唐诗四首》: 李白的《将进酒》: 人生得意须尽欢,莫使金樽空对月。 ,千金散尽还复来。
【单选题】Graphite is a form of carbon.Why can graphite be used as a lubricant?
A.
Graphite contains delocalised electrons which move throughout the structure.
B.
Graphite contains weak covalent bonds so the atoms move easily.
C.
Graphite has a low melting point so it easily turns into a liquid.
D.
Graphite has weak forces of attraction between layers so they can move.
【单选题】The graphite shape in ( ) is spheroidal.
A.
gray iron
B.
Malleable iron
C.
Nodular iron
D.
Vermicular iron
【单选题】The graphite shape in ( ) is floccular.
A.
gray iron
B.
Malleable iron
C.
Nodular iron
D.
Vermicular iron
【多选题】The grey pig iron usually includes ( ) according to the shape of graphite precipitation.
A.
grey cast iron
B.
nodular cast iron
C.
malleable cast iron
D.
vermicular cast iron
【简答题】Graphite fibers are not good in ______ resistance.
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