题型:选择题 Director Zhang Yimou often has his films _________ local contents, which foreigners are not familiar _________. A.base on; withB.base to; onC.basing on; toD.based on; with 查看答案
题型:单项选择题 当牙石指数(CI)为1时,是指A.龈上、下无牙石B.龈上牙石覆盖牙面1/3以下C.龈上牙石覆盖牙面1/3~2/3D.龈上牙石覆盖牙面2/3以上E.牙颈部有散在,或连续而厚的龈下牙石 查看答案