愈伤组织的建立和增殖需要在培养基中添加NAA。
参考答案：错
I'm planning to hold a party in the open air, but I can make no guarantees because
it _ the weather. [ ]
A. links with
B. depends on
C. connects to
D. decides on
煤气管道进行组装焊接时，管径≥（）毫米须采用双面焊接。
A.600
B.700
C.800
D.900
