33. In 2009 1 October1day, the Yong-Tai-Wen Railway was officially put into operation. The Ningbo-Taizhou-Wenzhou Railway passes through Ningbo (12 1.56 E, 29. 86 N)。
Total length from Taizhou to Wenzhou (120. 66 degrees 28 minutes east longitude. 02 N) is 275km. "harmony
The preset running speed of 10 EMU can reach 200-250km/h,
It used to take three hours from Ningbo to Wenzhou, but now it only takes 1 hour for 40 minutes.
Please answer according to the above information:
(1) Wenzhou is in the direction of Ningbo.
(2) Calculate the average speed of EMU from Ningbo Station to Wenzhou Station.
34. The General Administration of Quality Supervision, Inspection and Quarantine conducted spot checks on the quality of school supplies, and nine kinds of products (such as glue sticks, liquid glue, correction fluid, etc.). ) was discovered.
Formaldehyde exceeds the standard. Formaldehyde (CH2O) is a chemical substance that can cause chronic poisoning of human body, which has a wide and profound impact on students' health.
It's far. The molecular formula of formaldehyde is ▲, where the mass fraction of carbon is ▲.
35. When a doctor performs brain surgery on a patient, it is necessary to lower the patient's temperature to an appropriate temperature. Before preparing for the operation, the patient's cardiopulmonary function
Instead, it is a heart-lung machine.
(1) One of the functions of the heart-lung machine is to use "electric pump" instead of heartbeat to promote blood circulation.
As shown in the figure, the coil ab is wound and fixed at one end of the piston and connected with the fixed magnetic field.
The relative movement between iron drives the piston in the electric pump to make the blood flow directionally; valve
Doors K 1 and K2 can only be opened in one direction, and the pipeline is closed in the opposite direction. When the current in the coil
When flowing from A to B, the left end of the coil is N pole, and the piston will move to ▲.
The "power pump" is in the state of ▲ (fill in "draw blood" or "send blood").
(2) Another function of the heart-lung machine is to exchange heat with the "heat exchanger" and regulate body temperature through blood circulation. After monitoring,
The patient's body temperature rose from 65438 07℃ to normal temperature of 37℃ for 65438±0h. In the meantime, it is assumed that the heat required by the human body is completely made up of
The heat exchanger is provided, and the heat dissipation of the human body is not considered. Try to find the useful work done by the heat exchanger.
Assuming that the patient's mass is 60 kg and the specific heat capacity of human body is equivalent to that of water, then c = 4.2×103j/(kg℃).
36. Under the guidance of professional divers, a scientific research team went to Xin 'anjiang Reservoir to investigate the water subsidence.
Species, quantity and distribution of aquatic plants. The volume of the diving gas cylinders they carry is
7.2× 10-3m3, the empty bottle weighs 6kg, and is filled with 3kg for divers to breathe.
Liquefied air, as shown.
(1) Submerged plants belong to this ecosystem.
(2) With the increase of diving depth, the species of submerged plants gradually decreased. What caused this change?
The main reason is ▲.
A. increase of water pressure B. decrease of illumination C. increase of CO2 concentration.
(3) In the process of diving, the diving tube helps the diver to sink in the initial stage. Please calculate how many kilograms are needed at least.
After the air is liquefied, the diving tube will help the diver to float?
G is 10n/kg, and ρ water = 1.0× 10N/kg/m3.
37. In order to determine the composition of brass (copper-zinc alloy), take 100g of brass sample crumbs and divide 400g of dilute sulfuric acid into four parts.
When added to this sample, the measured data are recorded in the following table:
1, second, third and fourth
Add dilute sulfuric acid mass (g)100100100100.
Residual solid mass (g) 87 74 67.5 67.5
(1) The mass of the remaining solid measured for the second time is 74g, and its composition is as follows
For ▲.
A. Copper and zinc
(2) The mass ratio of copper to zinc in the brass sample is m copper: m zinc: ▲.
(3) Calculate the solute mass fraction of dilute sulfuric acid used, and draw the reaction generation diagram.
Relationship between hydrogen quality and adding dilute sulfuric acid.