常见金属的晶格有()、()和()。
参考答案:体心立方晶格;面心立方晶格;密排六方 晶格
Every student is required to watch the teacher carefully before _____ the chemistry
experiment. [ ]
A. performing
B. taking
C. picking
D. having
患者,男,54岁。右胁下痞块,推之不移,按之刺痛固定。此为()
A.虫积
B.气鼓
C.水鼓
D.癥积
E.瘕聚