咽后隙在中线处被_________分为左右两部分,咽旁隙被_________分为前后两部分,其中_________较大,内有一些重要结构。
参考答案:咽缝、茎突及其附着的肌肉、后隙
college students took part in the fighting against the floods. [ ]
A. A great many of
B. A large number of
C. A large amount of
D. A great deal of
A.a为动滑轮,B端钢缆受到滑轮组的拉力大小约为3G
B.a为动滑轮,B端钢缆受到滑轮组的拉力大小约为G
C.a、c为动滑轮,B端钢缆受到滑轮组的拉力大小约为3G
D.a、c为动滑轮,B端钢缆受到滑轮组的拉力大小约为G