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【单选题】
将 0.45 g 非电解质溶于 30 g 水中,使水的凝固点降低 0.15 摄氏度,已知 H 2 O 的 K b = 1.86 K · Kg · mol -1 ,则该非电解质的摩尔质量( g · mol -1 )是( )A.
100
B.
83.2
C.
186
D.
204
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举一反三
【单选题】Direction: Listen to the conversation and choose the best answer.
A.
She cant understand the man's point of view.
B.
The man should earn the bread.
C.
The man is responsible for his family.
D.
She can't agree more with the man.
【单选题】Direction: Listen to the conversation and choose the best answer.
A.
She was just telling a joke about quitting her job.
B.
She wasn't satisfied with her salary.
C.
She was fed up with counting money at her job.
D.
She was to quit her job and look for an accounting job.
【单选题】有关特征 X 线的解释,错误的是( )
A.
是高速电子与靶物质轨道电子作用的结果
B.
特征 X 线的质与高速电子的能量有关
C.
特征 X 线的波长由跃迁的电子能量差决定
D.
靶物质原子序数较高特性 X 线的能量大
E.
70kVp 以下不产生钨的 K 系特征 X 线
【简答题】下列属于会计工作岗位的是（ ）。
【单选题】有关特征X线的解释，错误的是（）
A.
高速电子与靶物质轨道电子作用的结果
B.
特征X线的质与高速电子的能量有关
C.
特征X线的波长由跃迁的电子能量差决定
D.
靶物质原子序数较高特性X线的能量大
E.
70kVp以下不产生K系特征X线
【单选题】Direction: Listen to the conversation and choose the best answer.
A.
He has to sit at the computer for half an hour.
B.
He will stop to enioy a coffee break.
C.
He will finish his report soon.
D.
He cannot afford to have a coffee break.
【简答题】下列属于会计工作岗位的是（ ）。
【单选题】Most of PowerShow.com's features are _______.
A.
convenient to develop
B.
expensive to buy
C.
difficult to log in
D.
easy to use
【简答题】Which direction did Bilbo choose to go?
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