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单选题 What do the flexible propeller blades developed by UBC researchers aim to do
学科：默认课程
时间：2026-05-17 10:55:21
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题目1单选题
What is (are) identified as the primary source of underwater noise produced by shipsA. Engine soundsB. Propeller cavitationC. Hull vibrationsD. Generator operation
题目2单选题
What do the flexible propeller blades developed by UBC researchers aim to doA. Increase ship speedB. Reduce cavitation noiseC. Lower fuel consumptionD. Enhance durability
题目3单选题
What did marine researchers use to mitigate noise from ship machineryA. Acoustic black holesB. Bubble screensC. Flexible polymersD. Quieter engines
题目4单选题
By 2040, the International Maritime Organization aims to reduce carbon emissions by ________ compared to 2008 levelsA. 50%B. 60%C. 70%D. 80%
题目5单选题
Which port offers financial incentives for ships meeting noise-reduction standardsA. Vancouver Fraser PortB. Port of RotterdamC. Port of ShanghaiD. Port of Singapore
题目6单选题
What happens if the spinal cord is only partially cutA. People lose all ability to move their bodyB. The brain can sometimes adapt to the damage, allowing for some recovery of movementC. It appears to have no significant effect on movementD. People immediately regain their full ability to walk
题目7单选题
Which part of the brain did researchers identify as being involved in adaptation after a spinal-cord injuryA. The frontal lobeB. The lateral hypothalamus (LH)C. The occipital lobeD. The temporal lobe
题目8单选题
What technique was used to confirm the role of the lateral hypothalamus (LH) in walking recoveryA. MRI scanningB. OptogeneticsC. PET scanningD. EEG monitoring
题目9单选题
Why were rats chosen over mice for testing deep-brain stimulation (DBS)A. Because rats have larger brains, making electrode placement easierB. Because rats respond better to DBS than miceC. Because mice do not suffer from spinal injuriesD. Because rats are more similar to humans in terms of neural function
题目10单选题
What was the outcome of using DBS in two human volunteers with spinal injuriesA. No improvement in walking abilitiesB. Temporary improvements that stopped when the current was turned offC. Significant improvements in walking abilities and achieving personal goalsD. Worsening of their condition
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