只分泌浆液的腺体是()
A．下颌下腺
B．唇腺
C．舌下腺
D．腭腺
E．腮腺
参考答案：E
In spite of failing to save every endangered species, we may ____ the majority from extinction. [ ]
A. reserve
B. preserve
C. deserve
D. serve
病儿，7岁。VO龋，备洞时意外穿髓，针尖大小。治疗方法宜采用（）
A.干髓术
B.直接盖髓术
C.间接盖髓术
D.根管充填-K
E.活髓切断术
