A:血浆7.35-7.45
B:胆汁7.1-7.3
C:胃液0.9-1.5
D:胰液7.5-8.0
正确的实验操作是科学探究的关键.下列实验操作正确的是( )
—It's red.
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已知抛一枚均匀硬币正面朝上的概率为,下列说法错误的是( )