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【多选题】
直接接触电击的防护措施的主要作用包括( )A.
防止人体触及带电体造成触电事故。
B.
防止人体过分接近带电体造成触电事故。
C.
防止短路。
D.
防止故障接地。
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【单选题】Coral(珊瑚) is not a plant but a variety of animal life ________ and bright colors.
A.
in different shapes
B.
in a different shape
C.
of different shapes
D.
of a different shape
【简答题】PCR引物延伸温度一般为
【单选题】How do fireworks produce their colors? Chemicals that give off bright, distinct colors when burned provide the spectacular colors associated with fireworks. Charcoal and iron, for instance, burn brill...
A.
shells that are put in a launcher
B.
heavenly bodies in the sky
C.
brilliant colors produced by fireworks
D.
compressed chemical powder
【简答题】Bright colors make people happier. They also make people more active.
【简答题】A.94 °C B.85 °C C.50 °C D.72 °C E.100 °C 10.PCR 变性温度一般为:( ) 11.PCR 退火温度一般为:( ) 12.PCR 延伸温度一般为:( )
【单选题】(3)The bright colors can make a small room _________ much bigger.
A.
arise
B.
arrange
C.
notice
D.
appear
【简答题】PCR引物延伸温度一般为 查看材料
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