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植物组培的培养基配制中,通常将以下药剂的( )先配制成浓度较高的母液或浓缩液置于冰箱中低温存放,使用进行量取、稀释,从而提高工作效率和减少误差。A.
蔗糖
B.
基本培养基中的各类物质
C.
激素
D.
琼脂
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【简答题】4 Complete the sentences with a suitable word
or phrase. ► If you shout angrily at a child, they might cry . 1 When you have a cold, you might ____ a lot. 2 If you eat onions, your ____ ...
【简答题】A. Read the sentences. Number them in time order. Then choose the answer that gives the writer's audience. 1. First, get an application form from the Office of Financial Aid in Room 232 of the Adminis...
【简答题】Complete the dialogue based on the given scenario with the words and expressions below. if you spend all your money That's a good idea If you get some money what should I do
【简答题】Complete each blank with correct words about money. pay / spend / waste / invest / earn / save / borrow 1. If you work, you ______ money. 2. If you go shopping, you ______ money. 3. If you buy somethi...
【简答题】PN结中内电场的方向是由( )区指向( )。
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