问题
单项选择题
已知溶液中蛋白质的百分含量为25%，你估算该溶液中氮的百分含量应为
A．2%
B．4%
C．6%
D．8%
E．10%
答案
参考答案：B
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已知溶液中蛋白质的百分含量为25%，你估算该溶液中氮的百分含量应为
A．2%
B．4%
C．6%
D．8%
E．10%
参考答案：B
| 从方框中选择合适的句子补全对话。 | |
| A: Kate，do you want to meet my old friends？ B: 1_____, Linda. A: Jack is that tall, thin boy in a white shirt. B: Is he the boy with light brown hair and blue eyes? A: Yes. The boy with light green hat is Robert. He's got brown eyes and yellow hair. B: 2_____. He's in a light blue shirt, 3_____ A: Yes, he is. The other boy in blue shirt, a dark blue shirt is Billy. B: 4_____ A: Oh, there are two girls with glasses here. One is Jane. The other is Nancy. The girl with small eyes and long hair is Jane. The other with short, black hair is Nancy. 5_____ | |
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