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【判断题】
粮食水分含量 17%~18% 为霉菌产毒的最佳条件。
A.
正确
B.
错误
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参考答案:
举一反三
【单选题】强腐蚀性介质的传热常采用以下哪种换热器
A.
夹套式
B.
套管式
C.
沉浸式
D.
喷淋式
E.
板式
【简答题】10 T account is so called because it resembles the letter _____. 1.11 The debit is on the _____ side of the vertical line. The credit is on the _____ side of the account. 1.12 “Dr.” stands for _____ ,...
【单选题】鲍伯通过计算机网络给爱丽丝发消息说同意签订合同,随后鲍伯反悔,不承认发过该条消息。为了防止这种情况发生,应在计算机网络中采用( )。
A.
身份认证技术
B.
数字签名技术
C.
消息认证技术
D.
防火墙技术
【简答题】(9分)将4molSO 2 和2molO 2 的混合气体置于体积可变的恒压容器中,在一定条件下发生如下反应2SO 2 (g) + O 2 (g) 2SO 3 (g)  ΔH v(正),达到上述平衡状态时,气体的总物质的量仍为4.2mol,则起始时n(SO 3 )的取值范围是 (4)若反应过程中SO 2 、O 2 、SO 3 物质的量变化如图所示。则反应进行至20min时,曲线发生变化的原因是___...
【单选题】在一定温度下的恒容密闭容器中,当下列哪些物理量不再发生变化时,表明下述反应:A(g)+2B(g)?C(g)+2D(g)已达到平衡状态(  )
A.
混合气体的压强
B.
混合气体的密度
C.
各气体的物质的量
D.
气体的总物质的量
【简答题】一定条件下,在一定体积的恒容密闭容器中,CO 2 与NH 3 在一定条件下反应生成尿素 CO 2 (g)+2NH 3 (g) CO(NH 2 ) 2 (s)+H 2 O(g) 根据题意完成下列各题; (1)500℃,用尿素表示该反应的反应速率,v(尿素)= mol/min. (2)该反应的正反应△H 0(填“>”或“(3)上图2表示某温度时一些反应物与产物物质的量(n)随时间(t)变化的关系。 ①...
【单选题】In 2018, internal auditors discovered that Fay, Inc., had debited an expense account for the $700,000 cost of a machine purchased on January 1, 2015. The machine's useful life was expected to be five ...
A.
$140,000.
B.
$280,000.
C.
$420,000.
D.
$700,000.
【单选题】不合理的烹调加工是
A.
煮菜适量加入淀粉
B.
煮骨头汤或鱼汤时适当加醋
C.
蔬菜先洗后切,急火快炒
D.
大米淘洗反复多次,使之精白
【单选题】不合理的烹调加工是
A.
煮菜适量加入淀粉
B.
煮骨头汤或鱼汤时适当加醋
C.
蔬菜先洗后切,急火快炒
D.
大米淘洗反复多次,使之精白
E.
蔬菜汤煮不宜久
【多选题】The Japanese balance of payments from 1994 to 1997 is as follows. All numbers are reported in billions of U.S. dollars. The last line gives the real effective exchange rate index of the yen relative t...
A.
The Japanese trade balance, which has been constantly positive over the time period, decreased dramatically from 1994 to 1996. The current account tracked the trade balance.
B.
The trade surplus was mostly used to invest abroad (negative capital and financial account).
C.
In each year, the current account surplus exceeded the capital and financial account deficit and official reserves decreased.
D.
In 1994 and 1995, the yen kept appreciating in real terms (its real effective exchange rate was 127 in 1992 and moved up to 175 in 1995). The strong yen hurt the international competitiveness of Japan and its trade balance strongly deteriorated until 1996.
E.
In each year, the current account surplus exceeded the capital and financial account deficit and official reserves increased.
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