Name the type of gears that have their teeth cut at an angle, which allows more than one tooth to be in contact, and carry more load than equivalent-sized spur gears and operate more quietly and smoothly.
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Helical gears have their teeth cut at an angle that allows more than one tooth to be in contact.
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Who regulates and sets certification standards for highway diesel engine emissions in the state of California?
A. California Trucking Association B. California Better Business Bureau C. California Consumer Protection Agency D. California Air Research Bureau
African Americans who fought for the Union Army in the Civil War
A. carried out reprisals against captured slaveowners. B. served mainly in military support units. C. included the brave and accomplished 54th Massachusetts Infantry Regiment, which suffered heavy casualties during the Union siege of Fort Wagner, South Carolina in 1863. D. accounted for less than 1 percent of total Union enlistments. E. refused to serve under white officers.
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