皱纸状白斑多见于：（）
A.唇红粘膜
B.口角区颊粘膜
C.舌腹口底粘膜
D.牙龈粘膜
E.硬腭粘膜
参考答案：C
After five hours' drive, they reached ______they thought was the place they'd been dreaming of.[ ]
A. which
B. where
C. that
D. what
如图所示，质量为m的物体A放在倾角为37°的倾角上，A面与斜面的动摩擦因数为0.1，那么对A施加一个多大的水平力，可使A物体沿着斜面做匀速直线运动？（已知：sin37°=0.6cos37°=0.8）
