光合细菌分离成功的关键,在于选择适宜的富集和分离的培养基以及适宜的培养条件()。
A. 对
B. 错
光合细菌的培养液和容器不需要进行灭菌就可以直接进行接种()。
A. 对
B. 错
This language study was __________ by Professor Li.
A. undertake
B. undertaken
C. taken
The book made a great __________ on its readers.
A. impact
B. impect
C. perform