同种生物的体细胞中的染色体( )
A.数量相同,形态不同,但成对
B.数量相同,形态相似,成对
C.数量不稳定,形态不相同,成对
D.数量不稳定,形态相似,成对
答案:B
— Thank you for saving me out of the terrible earthquake in Wenchun, uncle.
— _____, little Lang zhen. It's our duty. Everyone will certainly do so. [ ]
A. I'm so surprise
B. No, never mind
C. My pleasure
D. With pleasure
当路面水泥混凝土的7d强度达不到28d强度的70%时,应分析检查原因,并对混凝土的配合比作适当的修正。 ( )