制造民用枪支的企业,由()核发民用枪支制造许可证件。
A.国务院公安部门
B.省级人民政府公安机关
C.市级人民政府公安机关
D.国家工商行政主管部门
参考答案:A
Safety in school has been of great concern because of the frequent reports ________ students got
injured or killed while in school. [ ]
A. that
B. when
C. which
D. what
下列哪些结构的上皮由毛细胞和支持细胞组成().
A.球囊斑
B.椭圆囊斑
C.壶腹嵴
D.螺旋器
E.椭圆囊和球囊