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【多选题】
用微量凯氏定氮法侧定食品中蛋白质含量时,在燕馏过程中应注意A.
先加 40 ％氢氧化钠，再安装好硼酸吸收液
B.
热源要稳定
C.
冷凝水在进水管中的流速应控制适当、稳定
D.
蒸馏一个样品后，应立即清洗蒸馏器至少二次
E.
加消化液和加 40 ％氢氧化钠的动作要慢
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举一反三
【单选题】听力原文：(A) The man is driving a machine. (B) The tractor is pulling back toward construction materials. (C) The tractor is moving equipment. (D) The man is using a hand tool to fix the machine.
A.
B.
C.
【简答题】The tractor is very clever and very strong. ____、 ____and strong the tractor is!
【简答题】is to resist the _____________ to buy a tractor
【简答题】tractor
【单选题】Which of the following is NOT true about the yearly tractor pull in Chapel Hill, Tennessee?
A.
People hire pullers to compete.
B.
The first tractor pull started in 1976.
C.
It takes place in July every year.
D.
The sport is popular around much of the country.
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