(-2b-5)(2b-5)=______.
(-2b-5)(2b-5)=(-5-2b)(-5+2b)=(-5)2-(2b)2=25-4b2.
故答案为:25-4b2.
It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.
A.that
B.when
C.what
D.how
建筑工程质量监督机构的主要工作内容不包括()。
A.监督检查竣工验收
B.监督检查见证取样
C.提交工程质量监督报告
D.监督检查混凝土的质量