A:切片太厚
B:材料不在通光孔的正中
C:视野亮度不合适
D:玻片标本放反
世界最高峰珠穆朗玛峰海拔8848.13米,我国吐鲁番盆地最低处海拔-155米,两地之间的相对高度是
— You'd better stop smoking, or you'll _____various illnesses.
— OK, I'll give it up.
若抛物线y2=2px的焦点与椭圆x26+y22=1的右焦点重合,则p的值为( )