【单选题】下列各项中的计算结果正确的是( )
A.
标准状况下,2.24 L N 2 和NH 3 的混合气体:原子间共有3×6.02×10 22 个共用电子对
B.
常温下,Fe(OH) 3 悬浊液中由Fe(OH) 3 电离出的 c (OH - )≈10 -10 mol·L -1 :溶液的pH约为4
C.
0℃时,22.4 L密闭容器中充入88 g CO 2 气体:容器中的压强约为1个大气压
D.
标准状况下,1体积水中溶解了40体积NH 3 :该溶液的质量分数为97.4%
【单选题】设N A 为阿佛加德罗常数的数值,下列说法正确的是
A.
1 L 0.1mol?L -1 Na 2 CO 3 溶液中有0.1N A 个CO 3 2-
B.
常温常压下,22gCO 2 中共有2N A 个共用电子对
C.
0.1mol Na 2 O 2 与水完全反应,转移的电子数为0.2N A
D.
2.8gN 2 、CO和C 2 H 4 组成的混合气体所占有的体积约为2.24L
【单选题】Which of the following items should be accounted for as a capital expenditure?
A.
The monthly rental cost of an office building.
B.
Sales taxes paid in conjunction with the purchase of office equipment.
C.
Costs incurred to repair leaks in the building roof.
D.
Maintenance fees paid with funds provided by the company capital.
【判断题】图示结构AB杆的内力为5Pd/(2h)。【图片】
【单选题】MINUTES OF THE MEETING BM#104 Monthly Meeting of the Advisory Committee on Affirmative Action Call to order: Ms. Karen Powers, President Present: Susan Branch, Kathleen Goodwin, Karen Molzan, Margaret...
【单选题】Which of the following is not an example of a fixed cost?
C.
Factory insurance cost
D.
Depreciation on a factory building
【单选题】Which of the following is not a feature of house purchase? ( )
A.
This loan is for those who cannot get a loan from a building society or bank.
B.
It is a home loan available to First Time Buyers.
C.
The maximum term of loan is 30 years.
D.
The loan is repaid at a fixed interest rate at monthly intervals.