A:漠河以北
B:天山山脉
C:四川盆地
D:青藏高原
Excuse me, sir. I bought the shoes yesterday, but they are in different sizes. One is size 37, _____is size 38.
制作临时玻片标本时,在盖玻片的右上方不小心留下了一个小气泡,用低倍镜观察时,气泡可能出现在视野的