球状星团由大约()颗恒星组成。
A、几百
B、几千
C、几万
D、几十万或更多
参考答案:D
Over the past decades, the population in this country because of the rising birth rate, immigration and the declining death rate.
A.has been increasing
B.have been increasing
C.had increased
D.have increased
肿物穿刺取材室的基本设施不包括()。
A.室内紫外线消毒设备
B.穿刺用器械和器械柜
C.石蜡切片机
D.用于实施穿刺术的检查床、椅
E.穿刺、急救用药物和药品柜