在网络计划中，关键线路上相邻两项工作间的时间间隔必为零。（）
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等步距异节拍流水施工就是成倍节拍流水施工。（）
A. 对
B. 错
Which statement is not right about aflatoxins?
A. They cause liver damage and liver cancer ;
B. They are produced by many species of Aspergillus ;
C. They are produced by the fungus that invaded human hosts.
D. They are among the most carcinogenic substances known.
Which statement is not right about mycotoxins?
A. They are all proteins encoded by genes within chromosome;
B. Mycotoxicosis is a diseses caused by eating mycotoxins.
C. They are low-molecular-weight toxic metabolites of fungus;C.
D. They can harm humans and animals that ingest them, causing toxicosis (poisoning).
Which one of the following statement about ergosterol is not right?
A. a molecule carried in the cell wall of fungal cells;
B. a molecule carried in the membrane of fungal cells;
C. It is the target of antifungal drug --Amphotericin B;
D. It is the target of antifungal drug -- Azole drugs.
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