磨牙胎支托宽度为其
A.近远中径的1/4
B.近远中径的1/3
C.近远中径的1/2
D.颊舌径的1/2
E.颊舌径的1/3
参考答案:E
解析:磨牙抬支托宽度为其颊舌径的1/3。
New reports say peace talks between the two countries have broken ____with no agreement ________.
A.down, reached
B.out ,reach
C.in ,reaches
D.up, reaching
外生菌根可代替根毛作用,扩大根的呼吸面积,内生菌根可促进根内的物质运输。