什么是一类动物疫病？结合实际谈谈一类动物疫病发生时应采取的控制措施。
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现行营养评价，营养过剩主要包括哪些（）
A. 肥胖
B. 高体重
C. 身材瘦长
D. 超重
低密度脂蛋白中含量最高的载脂蛋白是（）。
A. apoA1
B. apoB48
C. apoB100
D. apoA2
In using reduction gears to obtain efficient propeller speeds, （）.
A. they must be located at the after end of the engine
B. they can only be used with one engine at a time
C. they eliminate the need for controllable pitch propellers
D. they are connected to the engine with a flexible coupling
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