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【单选题】
数列0，-1，0，1，0，-1，0，1，…的一个通项公式是( )A.
B.
cos
C.
cos
D.
cos
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举一反三
【单选题】The development of the light bulb __ partly as a result of the widespread availability of electricity and the need for cheap, cicada light.
A.
occurring
B.
was occurring
C.
was occurred
D.
occurred
【单选题】The light bulb ______ by Edison in the middle of the 1780s.
A.
is invented
B.
was invented
C.
invented
D.
invent
【单选题】Alight with no more power than ______ by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.
A.
as is produced
B.
that produced
C.
that is produced
D.
produced
【单选题】With a standard bulb, only 5% of the electricity is ______to light—the rest is wasted away as heat.
A.
compressed
B.
conformed
C.
converted
D.
confined
【简答题】店铺搜索中的热门关键词,卖家最多可添加 个搜索关键词。
【单选题】心肺复苏基本生命支持术的三步骤包括
A.
胸外心肺按压，开放气道，人工呼吸
B.
病情估计，人工呼吸，人工循环
C.
人工呼吸，人工循环，药物治疗
D.
人工呼吸，人工循环，脑复苏
E.
开放气道，人工呼吸，心脏除颤
【简答题】灯泡 light bulb
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