A headhunter sends a candidate into an interview only if he or she is ______.
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Questions 11 to 18 are based on the conversation you have just heard.
A. The doctor has stopped seeing new patients.
B. The doctor’s office will be closed tomorrow.
C. The doctor’s schedule is filled tomorrow.
D. The doctor can see the man tomorrow.
A.加热冷凝法 B.石油醚或乙醚回流提取法 C.碱水加热提取加酸沉淀法 D.水蒸气蒸馏法 E.硅胶层析法 利用香豆素挥发性，可采取的提取方法是
宣告失踪的法定期间为1年。 ( )
A. 对
B. 错
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