In the murder case, the suspect ______ all the charges against him, so the police had to collect new evidence and ______ new strategies to prove that he was guilty of the crime. [ ]

A. refused; employ  

B. rejected; apply  

C. denied; employ  

D. turned down ; use

熟石膏，人造石和超硬石膏是临床常用的模型材料，其物理机械性能有较大的差异，表现在

A．其膨胀率，超硬石膏＞熟石膏

B．其密度，人造石＞超硬石膏

C．其混水率，人造石＞熟石膏

D．其强度，超硬石膏＞人造石

E．其硬度，人造石＞超硬石膏