19.Thereportsaysthatnoteatingwellinolderageaffectsmoodandcaninfluenceappetite,which__turn,affectsnutrientintake.
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20.Shewassoworriedaboutweightthatsheoncenearlystarvedherself___deathwhenshediscoveredthatshehadgrownoutofapairofjeans.
13.Asstudentsbecomemoreconnectedtotheelectronicworld,teacherswillfindthemselvescompelledto________technologyintheclassroom.
为了不过于严重削弱轴和轮毂的强度,两个切向键最好布置成()。
A. 在轴的同一母线上
B. 180º
C. 120º~130º
D. 90º
平键B20×80 GB/T1096-2003中,20×80是表示()。
A. 键宽×轴径
B. 键高×轴径
C. 键宽×键长
D. 键宽×键高