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【多选题】
电取暖器所用的石英管状红外线元件的特点有（）。
A.
机械强度高
B.
辐射效率高
C.
安全性好
D.
热惯性小
E.
使用寿命长
F.
受碰易碎
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
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as
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with
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seeming
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clear
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apparent
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【单选题】Even plants can run a fever, especially when they are under attack by insects or disease. But (71) humans, plants can have their temperature (72) from 3,000 feet away—straight up. A decade ago, (73) ...
A.
of
B.
in
C.
for
D.
on
【单选题】Even plants can run a fever, especially when they are under attack by insects or disease. But (71) humans, plants can have their temperature (72) from 3,000 feet away—straight up. A decade ago, (73) ...
A.
where
B.
which
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how
D.
when