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【判断题】
通常气相色谱进样器(包括汽化室)的污染处理是后清洗。主要的污染物是禁进样隔垫的碎片、样品中被碳化的高沸点物等,对这些固态杂质可用不锈钢桶针,然后再用乙醇或丙酮冲洗。()A.
正确
B.
错误
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举一反三
【单选题】下列关于实验室安全守则描述不正确的是
A.
加热试管时，不能将试管口指向自己或他人
B.
嗅闻气体时，需用手轻拂气体，扇向自己后再嗅
C.
能用已点燃的酒精灯去点燃别的酒精灯
D.
会产生刺激性气体的实验，应在通风处进行
【简答题】听下面一段材料，回答第1-3题。 1. What did the teachers do after Tim got into trouble? A. They always punished him. B. They talked to his parents. C. They often laughed at him. 2. Why did Tim lie down with his bike...
【简答题】请听下面一段材料，回答第1-3题。 1. What did the teachers do after Tim got into trouble? A. They always punished him. B. They talked to his parents. C. They often laughed at him. 2. Why did Tim lie down with his bik...
【单选题】What does the writer mean when she says “it is un-American to say so” in Para. 2?
A.
Americans usually do not ask the questions above.
B.
American people feel scared of aging and would do anything possible to delay aging.
C.
It is not decided by what Americans say.
【简答题】句子积累——默写句子。 (1)《观沧海》中展现海岛生机勃勃的诗句是: ;最能反映诗人博大胸襟的诗句是: 。 (2)《闻王昌龄左迁龙标遥有此寄》中表达诗人对友人的关心的诗句是: 。 (3)《次北固山下》中道出新旧更替的哲理的名句是: 。 (4)《天净沙·秋思》中表现天涯游子漂泊无依的愁苦之情的句子是: 。
【单选题】It is Tim, my best friend in my childhood, who tells me he always dreams of ______ for him to go to Shanghai to study and live there.
A.
there to be a chance
B.
there is a chance
C.
there being a chance
D.
being a chance
【简答题】编写程序完成自增运算符的用法。(上传执行结果的图片) 2
【简答题】What does the writer mean when she says “it is un-American to say so” in Para. 2?
【单选题】When the writer says 'I don't care' ( paragraph 4 ), she means that she doesn't care about______.
A.
her babies any more
B.
the time to go to bed
C.
the writing of her book
D.
the possible effects of smoking
【多选题】下列关于微生物检验操作安全守则的描述，正确的是（）。
A.
进出实验室操作，可以偶尔不穿工作服
B.
进行高压灭菌、干燥等工作时，只要设定好时间，工作人员可以离开现场去吃饭或干别的
C.
严禁用口直接吸取药品和菌液
D.
工作完毕，两手用清水肥皂洗净，必要时可用（杀菌剂）新洁尔灭、过氧乙酸液浸泡手，然后用水冲洗
E.
实验完毕，对染菌带毒物品，进行消毒灭菌处理
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