【单选题】下列哪种方法使蛋白质沉淀而不能使蛋白质变性 :
【简答题】骨质的疏松部和折( )之交界处,静止段和折( )之交界处是骨折的好发部位。
【单选题】While eating my dinner, four mosquitoes bit me.
A.
This sentence contains a dangling modifier, and the correct one should be “While I was eating my dinner, four mosquitoes bit me.”
B.
This sentence contains a dangling modifier, and the correct one should be “While they are eating my dinner, four mosquitoes bit me.”
C.
This sentence is correct.
【单选题】After ________ dinner, Stephanie likes to play ________ guitar for a while in the garden.
【简答题】PowerPoint中有4种母版,写出其中3种母版的名称。
【单选题】一台4极的直流电动机,采用单叠绕组时,其绕组的支路数为______。