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【单选题】
用抓阄的方法随机抽取部分观察单位组成样本,此方法为A.
纯随机抽样
B.
机械抽样
C.
分层抽样
D.
整群抽样
E.
多阶段抽样
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【单选题】298K反应BaCl 2 · H 2 O(s)=BaCl 2 (s)+H 2 O(g)达平衡时, p (H 2 O)=330Pa。则反应的△rGmθ为( )。
A.
-14.2kJ/mol
B.
14.2kJ/mol
C.
142kJ/mol
D.
-142kJ/mol
【判断题】Learning to write concisely--to say in three words rather than ten--will mark you as a highly effective communicator.
A.
正确
B.
错误
【单选题】在 298K 反应 BaCl 2 ·H 2 O ( s ) = BaCl 2 ( s ) + H 2 O ( g ) 达平衡时, p ( H 2 O ) = 330 Pa 。则反应的 为 _____ kJ·mol -1 。
A.
-14.2
B.
14.2
C.
142
D.
-142
【单选题】在 298K 反应 BaCl 2 ·H 2 O(s) = BaCl 2 (s) + H 2 O(g) 达到平衡时, p (H 2 O)=330Pa ,则反应的 △ r G Ө m 为( )。
A.
-14.2 kJ·mol -1
B.
14.2 kJ·mol -1
C.
142 kJ·mol -1
D.
-142 kJ·mol -1
【单选题】在 298K 反应 BaCl 2 · H 2 O ( s ) =BaCl 2 ( s ) +H 2 O ( g )达平衡时, p ( H 2 O ) =330Pa ,则反应的∆ r G m θ 为( )
A.
－ 14.2kJ · mol -1
B.
14.2kJ · mol -1
C.
142kJ · mol -1
D.
－ 142kJ · mol -1
【单选题】298 K时，反应BaCl2·H2O(s)=BaCl2(s)＋H2O(g)，达平衡时p(H2O)=330 Pa，则反应的ΔrGmӨ为（ ）
A.
－ 14.2 kJ/mol
B.
＋ 14.2 kJ/mol
C.
＋ 139 kJ/mol
D.
－ 141 kJ/mol
【单选题】(2 ) Learning how to write is similar to learning how to speak in public in that writer should _____.
A.
overcome his or her nervousness in the first place
B.
take hold of a reader and talk to him or her before writing
C.
learn to use a typewriter or dictating machine
D.
talk to himself on paper
【简答题】One advantage in learning to speak compared with learning to write is that the speaker gets immediate feedback from the ( ), so the speaker can adjust the message immediately.
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