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【简答题】
分析某样品中 E 组分,以正十八烷为内标物,按色谱峰面积得内标物与 E 组分相对校 正因子 f=fe/fs=2.4 ,然后精密称 E 组分样品 8.623g ,加入内标物 1.9675g ,测出峰面 积为 72.2 cm 2 ,内标物峰面积 93.6 cm 2 ,计算样品中组分 E 的含量。
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举一反三
【单选题】The dog was killed by the boss of this restaurant without _______．
A.
mercy
B.
move
C.
shame
D.
strength
【单选题】The dog was surprised to see his______in the pool of water.
A.
reflection
B.
status
C.
imagination
D.
distinction
【简答题】The dog was different from others in that A) it could stand only on its hind legs. B) it had only two legs C) it was very attractive D) it had a very big abdomen
【单选题】下列关于数组特征的描述中不正确的是( )。
A.
数组是一种变量，由规则有序结构中具有同一类型的值的集合构成
B.
在VBA中不允许隐式说明数组
C.
Dim astrNewArray(20) As String这条语句产生有20个元素的数组，每个元素为一个变长的字符串变量，且第一个元素从0开始
D.
Dim astrNewArray(1 To 20)As String这条语句产生有20个元素的数组
【简答题】It was a peaceful Sunday morning. A butcher () heard the doorbell and thought it must be a customer. 1 he was surprised to see that a dog was coming into his shop. The dog had $10 and a 2 in its mou...
【单选题】职业性有害因素是指
A.
生物性有害因素
B.
物理性有害因素
C.
化学性有害因素
D.
生物性有害因素、 物理性有害因素、 化学性有害因素
E.
生产、劳动过程和生产环境中的有害因素
【单选题】The dog was buried ______.
A.
in his garden
B.
at his home
C.
on the top of a mountain
D.
at the side of a river
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