It was rumored that he was suffering from a tone in the kidney.
A. 主语从句
B. 宾语从句
C. 表语从句
D. 同位语从句
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It is estimated that 25 million school lunches are sold each day.
A. 主语从句
B. 宾语从句
C. 表语从句
D. 同位语从句
It’s doubtful whether the payment is legal.
A. 主语从句
B. 宾语从句
C. 表语从句
D. 同位语从句
It was a question whether he should get married.
A. 主语从句
B. 宾语从句
C. 表语从句
D. 同位语从句
蛋白质pI分别为4.6、5.0、5.3、6.7、7.3。电泳时欲使其中4种泳向正极，缓冲液的pH应该是 ()
A. 5.0
B. 4.0
C. 6.0
D. 7.0
E. 8.0
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