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如图：烧杯中倒入二氧化碳气体，观察到的现象是 ；说明二氧化碳具有的性质有： ① . ② . ③ 。
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when
B.
which
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that
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as
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A.
按压力度使胸骨下陷至少5cm
B.
按压部位为胸骨中下段
C.
下压和放松时间为1:2
D.
按压频率至少100次/分
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A.
C
B.
A
C.
B
D.
C
E.
D
F.
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G.
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B
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