有丝分裂中期观察,核中染色质卷缩成一定形状:1条染色体⇒()条染色单体(即1条染色单体由1条染色线组成)。
参考答案:2
— How is Emmy?
— I have no idea. She hasn't written to me ______ we met last time. [ ]
A. since
B. while
C. as
D. before
患者,男,72岁,近2年来全身皮肤瘙痒不适,冬重夏轻,躯干四肢未见原发疹,多见抓痕、血痂、轻度苔藓化。伴头晕、失眠、多梦。舌红,苔薄,脉滑数。
诊断为()。
A.风瘙痒
B.风热疮
C.白疕
D.白屑风
E.牛皮癣