单项选择题Please select one word from the following NINE words, and fill in each blank. The house is carefully externally and this also affects the interior, where the rooms are spacious and well-lit by natural daylight. A、workmanship B、disproportionally C、trustee D、completed E、simultaneously F、underbid G、coordinate H、 flawless I、contingency
单项选择题对下列培养基的叙述正确的是( )。 A、制作固体培养基必须加入琼脂 B、加入青霉素可得到放线菌 C、培养自生固氮菌不需要氮源 D、发酵工程一般用半固体培养基