对虾甲壳内表面有白色或淡黄色斑点为对虾白斑综合症的典型症状。

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问题判断题

答案

参考答案：对

仿写题

例1: cauliflowers	— What are these / those? — They're cauliflowers.
1. cucumbers	— _______________________________? — _______________________________.
例2: dogs	— Are these / those dogs? — Yes, they are.
2. mushrooms	— _______________________________? — _______________________________.
例3: girls / boys	— Are these / those girls? — No, they aren't
3. onions / cabbages	— _______________________________? — _______________________________.

选择题

A．SO₂在食品工业中可以用来防腐、抗氧化、漂白

B．合成氨工业需要高温高压催化剂

C．硫酸工业中用水吸收SO₃

D．硫酸工业中沸腾炉排出的矿渣可供炼铁